Quantity   Component name
2 × BBC micro:bit One will be the transmitter, the second will be the receiver
1 × BBC micro:bit AAA battery holder with batteries
1 × USB micro cable to connect the receiver microbit to your laptop
1 × BBC micro:bit wrist holder, home made build instructions at: https://sites.google.com/site/hardwaremonkey/blog/microbitwristholder
1 × Smart phone arm band $5 from eBay, to make the wrist holder
1 × 5 mm x 20 cm elastic To make the wrist holder
1 × needle and thread To make the wrist holder
1 × optional: blink(1) USB LED https://blink1.thingm.com/buy/
1 × optional: Freetronics Leostick https://www.freetronics.com.au/products/leostick