The BBC micro:bit is a pocket-sized open-source hardware ARM- based embedded computer system that can be used to teach children and apply coding within physical computing. It has an LED light display, buttons, sensors and many input/output features that, when programmed, let it interact with you and your world. 
 

• The front of BBC micro:bit has 25 programmable LEDs arranged in a 5 x 5 grid, two programmable buttons, a programmable touch logo and a microphone indicator.
• The back of the BBC micro:bit has the microphone, processor, speaker, radio/Bluetooth antenna, accelerometer, and compass.
• There is also a built-in light sensor and temperature sensor, as well as pins along the bottom that can be used to connect accessories. The BBC micro:bit can be plugged into a computer with a USB connector or accessed through an app on a tablet.
• A battery pack can be connected to the BBC micro:bit to provide portable power on the go.