Every microbit has a 2.4 GHZ radio module bulit into the CPU.
Below is demo of what we are going to do in this short tutorial–send a number of radio waves from one microbit to the other:

Microbit 1: The Sender
Radio Group. Both microbits must be set to the same group number. I chose the number 5. Just make sure you set that first (on start).

Microbit 2: The Receiver
Most common error is not setting the same radio group on both microbits.
