Ideal for avid bike racers and serious pedal pushers, the TomTom Multi-Sport GPS Watch + Cycle includes a Bluetooth-enabled heart rate monitor and Bluetooth Cadence/Speed Sensors. The heart rate monitor is for use when running and biking; it isn't waterproof and cannot be used when swimming. The Cadence/Speed Sensors primarily measure ascent and cadence, although the watch, when combined with the sensors, will give you the following key statistics while biking: clock, duration, distance, speed, average speed, cadence, calories burned, heart rate, altitude, and ascent. Make sure to configure the wheel size correctly if you use the Cadence/Speed Sensors, as the watch will solely rely on the sensors instead of the watch's built-in GPS functionality. The TomTom Multi-Sport GPS Watch provides runners, bikers, and swimmers with accurate, real-time metrics to enhance performance and gives a baseline for future workouts. Engaging with your every stride, stroke, or pedal, QuickGPSFix Technology precisely pinpoints your location within mere seconds, tracking your every move in conjunction with a built-in, 3D accelerometer. The accelerometer allows this watch to be used indoors when you're running on a treadmill or swimming laps at the pool (doesn't work in open water). The super-comfy, perforated rubber watch strap won't stick to your wrist when sweat starts pouring, and the included bike mount attaches to most road bikes for easy viewing when you're biking at breakneck speeds. An extra-large, scratch-resistant LCD display shows running, cycling, and swimming stats at a glance for quick informational updates on whether you should continue on pace, speed up, or slow down--according to predefined goals and previous efforts. Four unique graphical training modes allow you to surpass predefined goals, stay on pace, count laps, and race against previous bests. Goal mode sets a predetermined goal based on metrics like time, distance, or calories burned. The watch will keep you on ..