This sleek sports watch is the world's first to give you an accurate heart rate measurement without a pesky chest strap (just rest two fingers on the sensors). It also features a patented system that allows you to track the calories you burn in MIO's 3500 Calorie Countdown mode, and the ones you consume (if beeps if you go overboard). Features five different exercise timers and includes two interchageable straps (black/grey and blue/orange). The perfect fit for slender wrists.