The stylish, lightweight PCB is designed to fit snugly against the BBC micro:bit and features a built-in buzzer and 3V coin cell holder. When assembled, the MI:power board is connected directly to the 3V, GND and P0 connections on the micro:bit. The 3V and GND connections provide power to the micro:bit and the built-in buzzer is connected to P0, which is the default output pin when using the audio functions in the Block Editor software. The board has an easy to access on/off switch, which makes it easy to turn a project on and off, rather than have to disconnect the power supply from the BBC micro:bit. Once the unit is assembled and attached to the BBC micro:bit the mechanical fixings prevent the battery from being removed unless you use a screwdriver, so whatever the use, the battery will remain safely in place. Spacers, fixings and a battery are all provided. Please Note: BBC micro:bit is NOT included. Features: Power your BBC micro:bit from a stylish PCB. On-Board buzzer. Easy access on/off switch. Contents: 1 x MI:power board for the BBC micro:bit. 3 x Counter Sunk M3 x12mm Machine Screws. 3 x M3 Hex Full Width Nuts. 3 x Plastic Spacers. 1 x CR2032 3V Coin Cell.