A Robit is a device made by Elecfreaks and which is micro:bit compatible. The device has:

 - 2 Line detecting sensors

 - 2 servo motors

 - 4 I/O ports (analog)

 - 10 I/O ports (digital)

 - Buzzer 

 - Light detector

 - 2 LED Lights

find out more here (Elecfreaks)