It is also mentioned that each micro:bit robot is equipped with an accelerometer which can transmit information about its movement and location.

The second micro:bit detects gestures with its accelerometer, and then sends the relevant commands to the robotic arm’s micro:bit over its built-in radio link.

The second micro:bit detects gestures with its accelerometer, and then sends the relevant commands to the robotic arm’s micro:bit over its built-in radio link.