This kit contains a micro:bit board, a USB cable, and a battery holder. This is a basic kit for using micro:bit. micro:bit board is launched by BBC which aims to help children in or above 7 grade to learn to program better. micro:bit board has abundant board resources like 5*5 LED metric dot array, 2 buttons, USB ports, etc. It is only pocket size but very powerful. You can program, customize or control it at well.