micro:bit watch kit is a set of wearable devices based on power:bit. Just by doing some simple assembly, you can DIY a micro:bit watch.
Fix your micro:bit and power:bit together with screws.
Insert two Li-batteries into the battery socket.
Fix the back crystal board with 3 hexagon screws.
Make the longer watch band through the holes on the crystal board. See picture below.
Optionally, you can plug in the rainbow LED to make it looks more beautiful.
1 x powerbit
1 x Acrylic Case
1 x Nylon Watch Band
1 x 8 bead Rainbow LED Ring