This Alarm Calls Your Phone if Somebody Touches Your Bike

Here's a nifty crime-prevention device with a hidden benefit: The instant somebody moves your bike it starts blowing up your phone, making you look intriguingly mysterious as you scramble out the door like Batman.

The Cricket is a Bluetooth-enabled discus roughly an inch across that fixes to the underside of your seat with a zip tie. An internal motion sensor detects when the bike is being jostled – presumably by somebody with bad intentions, although a rider locking their bike next to yours or a strong gust of wind could also set it off. It then pings your Apple device (no Android compatibility yet) with a chirp, so you can go kick the thief's butt, or get your own butt kicked, depending on how it plays out. You could also call the police, of course, and hope they get there quick.