Can you be too well prepared? The team behind ICEdot doesn’t think so. Their diminutive ICEdot crash sensor sticks to your helmet (bike, motorcycle, ski/snowboard, etc) and monitors for head impact using accelerometers and gyroscopes. Should you take a nasty fall, ICEdot communicates to your smartphone using Bluetooth, calling a preset number for help after a 15 second countdown (which can of course be cancelled if you’re still fully conscious).

Learn more at Amazon – $120