Small size is very suitable for DIY 40P MICROBIT horizontal socket compact socket USB: 5V1A power supply meets the requirements of large driving force. Support 3V-5V sensor module Comes with buzzer (switch) Power supply mode: USB 5V 1A On-board functions: 5V1A self-recovery fuse Buzzer (PO interface) 3.5mm audio port (P0 interface) Toggle switch (used to switch buzzer music output and audio port sound output. USB power switch Five gold fingers, which are seamlessly butted with the 0, 1, 2, 3V and GND pins of microbit to protect the gold fingers of microbit. Provide 5V and 3.3V power interfaces, and support 3-5V sensor modules (onboard 5V and 3.3V power indicators). Include pins 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19, 20. Simulated feet: 0, 1, 2 Type: Microbit expansion board Usage: micro:bit horizontal adapter for elementary and secondary schools Product description: It supports Scratch Python programming and 3-5V sensor module. Application field: Internet of Things IoT color:Black Material:PCB Size: about 57 x 45mm Package Contents: 4 x Expansion Board