4131 Fraser St. Vancouver BC

CATEGORIES
- Electronic Components
  - - Resistors
      
      1/4 W
      
      1/2 W
      
      Surface Mount Device(SMD)
      
      Resistor Network
      
      PTC RESISTORS
      
      NTC RESISTORS
  - - Capacitors
      
      Electrolytic
      
      Surface Mount Device (SMD)
      
      Super Capacitors
      
      Variable
      
      Ceramic
      
      Capacitor Kits
  - - Fuses
      
      Glass Fuse
      
      Circuit Breaker
      
      Thermal Fuse
      
      Ceramic Fuse
      
      Auto Fuse
      
      Fuse Holders
  - - Diodes & Rectifiers
      
      Bridge Rectifiers
      
      Zener Diodes
      
      Schottky Diodes
      
      Fast Recovery Diode
      
      Germanium Diode
      
      Power Diode
  - - LEDs
      
      LED Strip
      
      LED String
      
      LED Ring
      
      Electro- luminescent Wire (EL)
      
      LED Controllers
      
      LED Drivers
  - - Potentiometers
      
      Trimmer
      
      Slide
      
      Wire Wound
      
      Multi-Turn
      
      Potentiometer Accessories
      
      Single Turn
  - - Relays
      
      Solid State Relay
      
      Automotive Relay
      
      AC Relay
      
      DC Relay
      
      Timer Relay
      
      Remote Relay Modules
  - - Switches
      
      Toggle
      
      Push Button
      
      Rocker
      
      Slide
      
      Tactile
      
      Rotary
  - - Integrated Circuits & Transistors
      
      2S series
      
      74:HC
      
      Opto-Couplers
      
      MOSFET
      
      TRIAC
      
      Regulator
  - - Other Electronic Components
      
      Inductors
      
      Oscillators and Crystals
      
      Chassis Mount Transformers
      
      Solenoid
      
      IC Sockets
      
      Electret Microphone
      
      Peltier Plate
      
      Knobs
      
      Light Bulbs
      
      Carbon Brush Replacement
  - - Featured Items
      
      LED RGB STRIP KIT, 12V...
      
      CA$90.00
      
      Quick view
      
      NEOPIXEL DIGITAL RGB LED...
      
      CA$65.00
      
      Quick view
      
      CONTROLLABLE 100 LED STRING...
      
      CA$18.00
      
      Quick view
  - - NEOPIXEL LED STRIP...
      
      CA$35.00
      
      Quick view
      
      LED CONTROLLER 12V 5A W/ LEADS
      
      CA$10.00
      
      Quick view
      
      LED STRIP 5050, 12V, COLD...
      
      CA$15.00
      
      Quick view
- Prototyping Tools
  - - Micro-Controllers
      
      Arduino
      
      Arduino Compatible MCU
      
      Banana Pi
      
      BeagleBone
      
      Industrial Shields PLC
      
      Raspberry Pi
      
      Teensy
    - More mirco-controllers
      
      More Micro-Controllers...
    - Sensors
      
      Accelerometer / Gyro Sensor
      
      Distance Sensor
      
      Flex Sensor
      
      Humidity/ Temperature Sensor
      
      Vibration Sensor
      
      Hall Effect Sensor
      
      Rotary Encoder
    - More Developement Tools
      
      More Sensors...
  - - Prototyping
      
      Breakout Boards
      
      Copper Clad
      
      BreadBoard
      
      Printed Circuit Board (PCB)
      
      Conductive Materials
      
      Header Pins and Sockets
      
      BusBoard Prototype Systems
    - More Prototyping
      
      More Prototyping...
    - Modules
      
      Audio Modules
      
      Bluetooth
      
      Relay Module
      
      RF Module
      
      Voltage Step Up/Down
      
      Display Module
      
      Charging Module
    - More Modules
      
      More Modules...
  - - Featured Items
      
      ARDUINO UNO Rev3
      
      CA$33.00
      
      Quick view
      
      RASPBERRY PICO PI BOARD
      
      CA$12.00
      
      Quick view
      
      RASPBERRY PLC ETHERNET 21...
      
      CA$560.00
      
      Quick view
    - Other Prototyping Tools
      
      DIY Kits / Robotic Kits
      
      Books & Magazines
      
      littleBits
      
      Atlas Scientific
      
      AVR / PIC Programming Tools
    - More prototyping Tools
      
      More Prototyping Tools...
- Wire & Cables
  - - Wires
      
      Heat Press Wires
      
      High Temperature Wire
      
      Magnet Wires
      
      Resistance Wires
      
      Silicone Hook Up Wires
      
      Solid Hook-Up Wires
      
      Stranded Hook-Up Wires
      
      Teflon Hook Up Wire UL1332 FEP
      
      Wire Wrapping
  - - Cables
      
      Computer Cables
      
      DMX Cables
      
      Fiber Optic Cable
      
      Multi-Conductor Cables
      
      Network Cables
      
      Power Cables
      
      RF and Coaxial Cables
      
      Ribbon Cables
      
      Telephone Cables
  - - Cable Management
      
      Accessories
      
      Cable Bushings
      
      Cable Clips/ Clamps
      
      Cable Markers
      
      Cable Ties
      
      Conduits
      
      Fibreglass Tubings
      
      Grommets/ Eyelets
      
      Heat Shrink Tubings
      
      Hole Covers
      
      Spiral Cable Wraps
      
      TechFlex Braidings
      
      Waterproof Fittings
      
      Wire Duct / Wire Track
      
      Wire Taps
  - - Featured Item
      
      STRANDED HOOK UP WIRE KIT...
      
      CA$30.00
      
      Quick view
      
      MULTICORE CABLE 4X22AWG...
      
      CA$0.85
      
      Quick view
      
      ENAMEL MAGNET WIRE...
      
      CA$15.50
      
      Quick view
      
      BRAIDED SLEEVING, PET 1/2"...
      
      CA$0.85
      
      Quick view
- Audio Selections
  - - Audio Cables
      
      1/4" to 1/4"
      
      1/4" to RCA
      
      1/4" to XLR
      
      3.5mm to 1/4"
      
      3.5mm to 3.5mm
      
      3.5mm to RCA
      
      3.5mm to XLR
      
      Digital Coaxial
      
      Hi Fidelity (HI-FI)
      
      MIDI Cables
      
      Optical Audio (Toslink)
      
      RCA to RCA
      
      Speaker Cables
      
      Speakon Cable
      
      XLR to RCA
      
      XLR to XLR
    - Audio Connectors
      
      Audio Connecting Adapters
      
      Chassis Mount
      
      Inline Cable End Connector
      
      Neutrik Connector
  - - Featured Items
      
      YAQIN TUBE AMPLIFIER,...
      
      CA$1,255.00
      
      Quick view
      
      YAQIN TUBE AMPLIFIER,...
      
      CA$955.00
      
      Quick view
      
      YAQIN TUBE AMPLIFIER,...
      
      CA$1,050.00
      
      Quick view
      
      TUBE, JJ, 12AX7-S / ECC83S
      
      CA$28.00
      
      Quick view
      
      TUBE, JJ, 6V6S, APEX...
      
      CA$152.00
      
      Quick view
      
      TUBE, JJ, 6L6GC, APEX...
      
      CA$174.00
      
      Quick view
- Battery Products
  - - Batteries
      
      Lead Acid
      
      Lithium Polymer
      
      Lithium Ion
      
      Nickel Metal Hydride
      
      Alkaline/ Standard
      
      Coin Battery
      
      Phone Replacement Batteries
      
      Standard Lithium
  - - Holders & Clips
      
      AA HOLDER
      
      AAA HOLDER
      
      9V HOLDER
      
      C Cell HOLDER
      
      D Cell HOLDER
      
      N Cell HOLDER
      
      LC18650 HOLDER
      
      Coin Cell HOLDER
  - - Other Battery Products
      
      Battery Charger / Tester
      
      Battery Bank
  - - BATTERY, RECHARGEABLE...
      
      CA$18.00
      
      Quick view
      
      BATTERY, RECHARGEABLE SLA,...
      
      CA$24.00
      
      Quick view
      
      iMAX-B6AC V2 BALANCE...
      
      CA$75.00
      
      Quick view
  - - Featured Items
      
      CHEERO POWER PLUS 4...
      
      CA$72.00 CA$80.00 -10%
      
      -10%
      
      Quick view
      
      CHEERO GRIP 4, PORTABLE...
      
      CA$44.99 CA$49.99 -10%
      
      -10%
      
      Quick view
      
      CHEERO POWER PLUS DANBOARD...
      
      CA$46.80 CA$52.00 -10%
      
      -10%
      
      Quick view
- Electronics Hardware
  - - Fans & Heat Sinks
      
      Fan Cables
      
      Heat Sinks / Compounds
      
      Fan Guard
      
      Fan Filter
      
      Fans - AC
      
      Fans - DC
  - - Enclosures
      
      ABS
      
      Diecast
      
      PVC
      
      Aluminium
      
      Sheet Metal
      
      Rack Instrument Enclosures
  - - Belts
      
      SBS Belts
      
      SBO Belts
      
      SBM Belts
      
      SBL Belts
      
      FBS Belts
      
      FBM Belts
  - - Nuts & Bolts
      
      Nuts
      
      Screws
      
      Washers
      
      Kits
      
      Standoffs
      
      PCB Support
  - - Connectors & Adaptors
      
      Power Connection
      
      DIN Connector
      
      KeyStone and Wall-mount
      
      Hardware Crimp Connectors
      
      Wire to Board / Wire to Wire Connections
      
      D-Sub Connectors
  - - Other Electronic Hardwares
      
      Magnets
      
      Ferrite Rings and Rod
      
      Rubber Feets
      
      Antenna Indoor / Outdoor
      
      Joystick / Remote Controller
      
      Telephone Accessories
  - - Featured Items
      
      METRIC NITRILE O-RING...
      
      CA$12.50
      
      Quick view
      
      SET SCREW KIT M3-M5
      
      CA$25.00
      
      Quick view
  - - SUPER NINTENDO SNES USB...
      
      CA$15.00
      
      Quick view
      
      MAGNET DISC NEODYMIUM D15x2MM
      
      CA$1.50
      
      Quick view
- Video & Display
  - - Digital & Analog Cables
      
      HDMI to HDMI
      
      HDMI to DVI
      
      DVI to DVI
      
      DVI to VGA
      
      VGA to VGA
      
      RCA to RCA
      
      RCA to S-Video
      
      S-Video to S-Video
      
      BNC to BNC
      
      Mini DisplayPort to HDMI
      
      Mini HDMI to HDMI Cables
      
      Components Video Cables
      
      Composite Video Cables
      
      Displayport to Displayport
      
      DisplayPort to HDMI
  - - Video Connectors
      
      Inline Cable End Connector
      
      BNC Chassis Mount
      
      Video Connecting Adapters
      
      HDMI / DVI Adapters
      
      Mini DVI Adapter
      
      USB Type C to Display Adapter
      
      Displayport Adapter
    - Video Converter & Splitter
      
      Coaxial Splitter
      
      HDMI Splitter
      
      HDMI Switch
      
      VGA Splitter & Converter
      
      Video Switch
      
      HDMI Converter
      
      HDMI Extender
  - - Featured Items
      
      USB TYPE-C TO VGA, DVI,...
      
      CA$35.00
      
      Quick view
      
      HDMI IN TO RCA OUT...
      
      CA$50.00
      
      Quick view
      
      HDMI SPLITTER 1 IN 2 OUT 2K...
      
      CA$60.00
      
      Quick view
      
      HDMI KVM SWITCH, DUAL USB...
      
      CA$42.00
      
      Quick view
      
      HDMI SWITCH BOX 3-IN 1-OUT...
      
      CA$52.00
      
      Quick view
- Chemicals
  - - All Chemicals
      
      Cleaners
      
      Contact Cleaners
      
      Cold Spray
      
      Compressed Air
      
      Flux / Flux Remover
      
      Heat Sink Compound
      
      Insulators / Sealants
      
      Keypad Repair
      
      Lubricants
      
      Adhesive
      
      PCB Chemicals & Supplies
      
      Shielding
      
      Butane
      
      Polymorph Plastic
      
      Other
  - - Popular Cleaners
      
      RUBBER RENUE 408A-125ML
      
      CA$13.00
      
      Quick view
      
      DEOXIT D5 CONTACT CLEANER
      
      CA$32.00
      
      Quick view
      
      MG CONTACT CLEANER...
      
      CA$28.00
      
      Quick view
      
      HEAVY DUTY MG FLUX REMOVER...
      
      CA$26.95
      
      Quick view
  - - Featured Items
      
      MG SUPER COLD 403A-285G
      
      CA$24.95
      
      Quick view
      
      ISOPROPYL ALCOHOL 99.9%...
      
      CA$19.90
      
      Quick view
      
      CHEMICAL, POLYMORPH - 1000G
      
      CA$46.50
      
      Quick view
      
      MG FERRIC CHLORIDE 415-500ML
      
      CA$14.95
      
      Quick view
- Tools & Equipment
  - - Featured Items
      
      ZHAOXIN 898D, 2-IN-1 SOLDER...
      
      CA$143.46
      
      Quick view
      
      DIGITAL MULTIMETER VC9808+
      
      CA$75.00
      
      Quick view
      
      BEST ELECTRONIC HEAT GUN...
      
      CA$28.50
      
      Quick view
      
      SCREW DRIVER SET 32-IN-1...
      
      CA$19.00
      
      Quick view
      
      BENCH DIGITAL POWER SUPPLY...
      
      CA$169.00
      
      Quick view
      
      TOOL, SHEAR CUTTER RDEER...
      
      CA$7.30
      
      Quick view
- Mechanical Hardware
  - - All Mechanical Hardwares
      
      Nuts/ Screws/ Washers
      
      Standoffs
      
      Shaft Coupler
      
      Timing Gear / Pulley
      
      Timing Belt
      
      Radial Bearing
      
      Mounting Hub
      
      Linear Bearing
      
      Din Rail and Accessories
      
      Linear Actuator
      
      Brackets
      
      Mini Shaft Rod and Accessories
      
      Gears
      
      Propellers
      
      Springs
      
      Ball Casters
      
      Misc Motor Accessories
      
      Misc Hardware
  - - Featured Items
      
      ALUMINUM SHAFT COUPLER, 5MM...
      
      CA$5.00
      
      Quick view
      
      METAL GEAR, 20 TEETH, 5MM...
      
      CA$5.00
      
      Quick view
      
      TIMING BELT 1:1 RATIO, 10...
      
      CA$18.00
      
      Quick view
      
      KIT, M3 COUNTERSINK FLAT...
      
      CA$16.00
      
      Quick view
      
      RADIAL BALL BEARING 608ZZ...
      
      CA$2.75
      
      Quick view
- 3D Printing & 3D Parts
  - - Featured Products
      
      ANET3D PRINTER N4 UV...
      
      CA$765.00
      
      Quick view
      
      VERTEX 3D PRINTER KIT K8400...
      
      CA$1,000.00
      
      Quick view
      
      ANET3D PRINTER ET5-US-1KG
      
      CA$420.00 CA$525.00 -20%
      
      -20%
      
      Quick view
      
      DELTA ROSTOCK MINI G2S 3D...
      
      CA$600.00
      
      Quick view
      
      ANET3D PRINTER A8 PLUS...
      
      CA$310.03 CA$499.00 -37.87%
      
      -37.87%
      
      Quick view
  - - Filaments
      
      ANET3D PLA FILAMENT,...
      
      CA$29.50
      
      Quick view
      
      MATTER3D, 3D PRINTER FIL....
      
      CA$35.00
      
      Quick view
      
      MG CHEM 3D PRINTER FILAMENT...
      
      CA$38.00
      
      Quick view
      
      MATTER3D, 3D PRINTER...
      
      CA$35.00
      
      Quick view
    - More Filaments
      
      More Filaments...
    - Other 3D Printing Materials
      
      Printers
      
      Printing Parts
      
      Chemicals
- Electrical Devices
  - - Motors
      
      Stepper Motors
      
      Pager/Vibration Motors
      
      Geared Motors
      
      DC Motors
      
      Servo Motors
      
      AC Motor
      
      Air / Water Pump
    - more motor
      
      More Motor...
  - - Power Supplies
      
      AC - DC Power Adapters
      
      AC - AC Power Adapters
      
      USB Power Adapters
      
      Bench Power Supplies
      
      Chassis Power Supplies
      
      Power Supply Accessories
      
      DC - DC Power Adapters
    - more power supplies
      
      More Power Supplies...
  - - Transformers
      
      TRANSFORMER, STEP UP/DOWN,...
      
      3000W
      
      CA$230.00
      
      Quick view
      
      TRANSFORMER, STEP UP/DOWN,...
      
      1000W
      
      CA$108.50
      
      Quick view
      
      TRANSFORMER VARIABLE...
      
      1000W Variable
      
      CA$185.00
      
      Quick view
  - - Featured Items
      
      BENCH DIGITAL POWER SUPPLY...
      
      CA$169.00
      
      Quick view
      
      BENCH DIGITAL POWER SUPPLY...
      
      CA$218.00
      
      Quick view
      
      BENCH PROG. DC SWITCH POWER...
      
      BENCH PROG. DC SWITCH POWER SUPPLY...
      
      CA$210.00
      
      Quick view
  - - Other Electrical Devices
      
      Transformers
      
      Networking Equipment
      
      Solar Panels
      
      PID Temperature Control
      
      Thermal Control
      
      Digital / Analog Timer
      
      Security & Automation
      
      Inverters
      
      Display / Monitor
    - more electrical devices
      
      More Electrical Devices...
- Computer & Cellular Hardware
  - - Networking Equipment
      
      Ethernet Switches
      
      Patch Panels
      
      Powerline Adapters
      
      Routers
      
      USB to Ethernet Adapters
      
      Wireless Adapters
  - - Computing Equipment
      
      Bluetooth Hardware
      
      Computer I/O
      
      Memory
      
      Mouse/Keyboards
      
      USB Applications
      
      USB Hubs
  - - Cell Phone Accessories
      
      Car Phone Holders
      
      Cell Phone Chargers
      
      iPhone/Lightning Accessories
      
      OTG Connections
  - - Featured Items
      
      TP-LINK 1 GIGABIT POWERLINE...
      
      CA$125.99
      
      Quick view
      
      OPTICAL AUDIO BLUETOOTH...
      
      CA$50.00
      
      Quick view
      
      USB 3.0 HUB, 4 PORTS, NO POWER
      
      CA$20.00
      
      Quick view
      
      USB2.0 TO IPHONE LIGHTNING...
      
      CA$20.50
      
      Quick view
  - - LIGHTNING TO 3.5MM...
      
      CA$8.00
      
      Quick view
      
      SAMSUNG / PIXEL USB TYPE-C...
      
      CA$25.00
      
      Quick view
      
      USB 2.0 VIDEO CAPTURE...
      
      CA$35.00
      
      Quick view
      
      DLINK, 5-PORT GIGABIT...
      
      CA$37.00
      
      Quick view
- Miscellaneous
  - - On Sale
      
      ANET3D PRINTER ET5-US-1KG
      
      CA$420.00 CA$525.00 -20%
      
      -20%
      
      Quick view
      
      ANET3D PRINTER A8 PLUS...
      
      CA$310.03 CA$499.00 -37.87%
      
      -37.87%
      
      Quick view
      
      EZO OXIDATION REDUCTION...
      
      CA$205.20 CA$228.00 -10%
      
      -10%
      
      Quick view
      
      EZO pH KIT
      
      CA$199.50 CA$210.00 -5%
      
      -5%
      
      Quick view
      
      EZO CIRCUIT TENTACLE SHIELD...
      
      CA$150.30 CA$167.00 -10%
      
      -10%
      
      Quick view
      
      reFILACTIVE REFLECTIVE...
      
      CA$135.00 CA$150.00 -10%
      
      -10%
      
      Quick view
      
      FILATRON E5 ESD CONDUCTIVE...
      
      CA$81.00 CA$90.00 -10%
      
      -10%
      
      Quick view
      
      CHEERO POWER PLUS 4...
      
      CA$72.00 CA$80.00 -10%
      
      -10%
      
      Quick view
  - - New Items
      
      XLR & 1/4" COMBO, CHASSIS...
      
      CA$6.00
      
      New
      
      Quick view
      
      TRANSDUCER, MEDIUM SURFACE...
      
      CA$20.75
      
      New
      
      Quick view
      
      DIY USB TYPE C PLASTIC HOUSING
      
      CA$1.00
      
      New
      
      Quick view
      
      DIY USB TYPE-C 24P, MALE,...
      
      CA$4.50
      
      New
      
      Quick view
      
      PUSH BUTTON IP67...
      
      CA$6.50
      
      New
      
      Quick view
      
      PUSH BUTTON IP67...
      
      CA$6.50
      
      New
      
      Quick view
      
      FFC PCB CONNECTOR, 14P,...
      
      CA$2.00
      
      New
      
      Quick view
      
      FFC RIBBON CABLE, 14 PINS,...
      
      CA$2.00
      
      New
      
      Quick view
BRANDS
- - FEATURED
  - ADAFRUIT
  - ARDUINO
  - SPARKFUN
  - Hammond
  - Meanwell
  - Weller
  - Yaqin
  - Zhaoxin
  - Waveshare
- - A-C
    Adafruit
    
    Anet
    
    Apex Tool Group
    
    Arduino
    
    Atlas Scientific
    
    Banana Pi
    
    Bare Conductive
    
    Best
    
    BotFeeder
    
    BPS System
    
    CAIG Laboratories
    
    CEC Corp
    
    Cheero
    
    Choseal
    
    Circuit Test
  - D-H
    Denko
    
    DUPU Electric Technology
    
    Electro Harmonix
    
    Elekit
    
    Gao Jie
    
    Geeetech
    
    Genelax Gold Lion
    
    Goldsource
    
    Groove Tubes
    
    Hakko
    
    Hammond
    
    Hongdak
- - I-M
    Industrial Shields
    
    Infinity Batteries
    
    IWISS
    
    JJ
    
    Lees Electronic Component
    
    Lichuang Technology Co. LTD
    
    Link Instrument
    
    LinLai
    
    Little Bits
    
    Make:
    
    MAKERbuino
    
    Matter3D
    
    Mean Well Power Supplies
    
    MG Chemicals
    
    Micro:Bit
    
    Mode Electronics
    
    Mullard
  - N-R
    Neutrik
    
    Osepp
    
    PC Cable World
    
    Pololu
    
    Pros Kit
    
    PSVANE
    
    Raspberry Pi
    
    Rdeer
- - S-T
    SCI
    
    Seeed Studio
    
    ShuGuang
    
    Solarbotic
    
    Solen
    
    Solomon
    
    Sovtek
    
    Sparkfun
    
    Sun Valley
    
    Switchcraft
    
    Tamiya
    
    TechFlex
    
    Tenda
    
    Tung Sol
  - U-Z
    Uni T
    
    VCell
    
    Velleman
    
    VeroBoard
    
    Victor
    
    Waveshare
    
    Weller
    
    WOER
    
    Yaqin
    
    Yik Shing Tat Industrial CO. LTD.
    
    Zhao Xin
PROJECTS
COMMUNITY
- - TOOLS
    
    RESISTOR READER
    
    CAPACITOR READER
- - FEATURED POSTS
    
    BEST ELECTRONIC STORE 2019
    
    MORE POSTS...
- - BCIT KITS
SALE
GST/HST Break

UHF JOINER (M/M) PL-259 SLF 5155

UHF JOINER (M/M) SLF 5155

All pictures are for illustrative purposes only.

PID# 25806

CA$5.00 EACH

Free shipping: On orders over $120 within BC

13 In Stock

Order now, processed next business day

Specifications

In stock 13 Items

Features

RF Connector	UHF PL 259 Male

Specific References

Frequently bought together

SMA FEMALE AND N-TYPE MALE...

SMA FEMALE AND N-TYPE MALE ADAPTER SLF-5316

CA$4.50 EACH

RUBBER FOOT/4, SQUARE ADHESIVE

Out of Stock

RUBBER FEET, 10x10x4mm, SQUARE ADHESIVE, 4PCS/SET

CA$1.00 /PKG

UHF MALE AND SMA FEMALE...

UHF MALE AND SMA FEMALE ADAPTER SLF-5319

CA$4.00 EACH

UHF PLUG TO N-FEMALE ADAPTOR

UHF PLUG TO N-TYPE FEMALE ADAPTOR

CA$5.00 EACH

BNC PLUG TO N JACK 21-149-0

BNC (M) PLUG TO N-TYPE (F) JACK

CA$5.00 EACH

UHF-JACK TO N-JACK SLF-5270

UHF JACK TO N-TYPE JACK SLF-5270

CA$5.00 EACH

N-CHASSIS JACK, SLF-5259

N-TYPE CHASSIS JACK, SLF-5259

CA$3.95 EACH

CERAMIC CAP 3KV 220PF

CERAMIC CAP 3KV 220PF

CA$2.50 /unit