The battery pack goes on the inside of the pocket on your blue shirt, at the top of it a band folds over the top of the pocket where the Micro:Bit is visible. Everyone in the class has one and they all connect to Mr. Carters computer. Using the Bluetooth you can do many things such as... 1) When everyone gets into the classroom and the micro:bits connect the register automatically completes its self. The only two reason you would have to altar it manually is if your micro:bit has died (no charge) 2) In class you could have a mini quiz on the board each pupil can use the A and B button on their micro:bit to answer each question - When you answer if the answer is correct the leds will shape a tick and if it's wrong the lights will shape a cross. 3) You can tell the teacher if you have done your homework or not by pressing A = yes or B = no - all without having t speak! 4) The micro:bit can also be used as a pointer (just like the Wii Remotes) eg... if the teacher asks you to point to the bigger oval and there are two ovals on the screen you can simply point your micro:bit at the bigger oval -- whilst pointing an icon representing the mouse pointer will appear on screen.