This gadget makes air-drumming sound like the real thing

Some gadgets are so straightforward they barely need explaining, but here we go anyway: these are a pair of motion sensitive sensors that you slip onto a pair of drumsticks and that let you play a virtual drum kit anywhere you like. It's called the Freedrum (get it?) and each unit pairs via Bluetooth to your phone. They use internal gyroscopes to detect motion and run for seven hours on an hour's charge. A single button turns them on and off, a single LED indicates a solid connection and ba