Compatible with all Raspberry Pi series: for Raspberry Pi 1 Model B+, Pi 2 Model B, Pi 3 Model B, Pi 3 Model B+, Pi 4 Model B, Pi Zero, Pi Zero W, Pi Zero 2 W All 40pins of Raspberry Pi are transferred out by screw terminals, which is convenient for cable access. Does not occupy other space, very convenient when doing DIY circuits. GPIO status LED and power 5V / 3.3V indication; GPIO output level high LED on, output level low LED off; 5V Red, 3.3V Red, GPIOs Light blue; The driving current of each LED is 4-6mA. 2x20 positions header connect to Raspberry Pi board. Terminal block pitch is 2.54mm.Silk screen sticker for easy identification. Wire gauge range is 18 to 28AWG. Stripping length is 4.5mm. WiKi --- wiki.52pi.com/index.php?title=EP-0168 GeeekPi Micro GPIO Terminal Block Breakout Module with GPIO Status LED for Raspberry Pi, GPIO Expansion Board Micro Connector for Raspberry Pi 4B/3B+/3B/2B/Pi Zero/Pi Zero W/Pi Zero 2 W