Description: Micro: bit is a microcontroller of ARM structure designed by the Britain BBC. It is only half size of a credit card, onboard with Bluetooth, accelerometer, electronic compass, three buttons, 5 x 5 LED dot matrix, mainly used for teens programming education. We specially make this basic starter kit for you to conveniently use micro:bit, in which includes a micro: bit control board, 1m USB cable and a battery holder (battery not included, wire length 160mm). USB cable is for uploading program to micro:bit. Battery holder is for power supply. And it comes with a switch button, very convenient for controlling. Specification: Material: Fr-4 Epoxy glass fiberboard Color: Black Size: approx. 14.5 x 9.2 x 4.3cm Package Includes: 1 Piece Micro:bit Basic Starter Learning Kit (Control board + Battery Holder + USB) Note: Color maybe slightly different due to different monitor. The above size is measured by hand, please allow slightly difference. Thanks !