Okdo BBC Micro:bit Expansion Board TS2179-A

The Okdo Microbit expansion board is compatible with all Microbit boards. The IO ports are extended by RJ11 interfaces, which is convenient for connecting external sensors. Inside is a 3.3V-5V levels conversion circuit. That applies 3.3V and 5V sensors. When the working voltage is 3.3V, you need to turn the DIP switch at V to 3.3V end, if the working voltage is 5V, you need to turn the DIP switch at V to 5V end, and turn the DIP switch at the power socket to ON end.

DC seat input voltage 7-12V recommended
3.3V maximum output Current 800mA
Compatible with all Microbit boards