The TomTom Cardio MultiSport Watch is here to push your endurance limits to elite levels. This multisport watch combines high accuracy, built in heart rate monitoring with QuickGPSFix Technology, keeping you on pace for your next marathon, bike race, or swim meet by measuring target heart rate, time, distance, and calories burned. Working indoors when it's dumping or freezing outside, the watch's built in accelerometer gives accurate readings on treadmills without the use of GPS. Incorporating innovative technology into your daily exercise routine, the watch's built in heart rate monitor frees you from chest strap heart rate monitors when you're running or swimming or biking. The high accuracy, built in heart rate monitor measures changes in blood flow in your wrist by shining light through the skin and detecting changes in reflection. To ensure its accuracy, TomTom tested this device alongside electrocardiography and determined it to be extremely accurate for light exercise and high intensity use alike. The built in intensity zones allow you to step up your game, one level at a time. Five zones help you burn fat or improve speed and fitness goals by regulating your intensity level each step of the way. In addition, this watch allows you to set target zones based on pace or heart rate, record laps based on time, distance, or user defined settings. Plus, you can race against your previous best performances. Bundled in the box with the Cardio MultiSport Watch is the following: bike mount, USB desk dock, and user manual. You can pair it with the CadenceSpeed Sensor sold separately for enhanced bike use, and connect it to both PC and Mac via the included USB desk dock. The TomTom MySports Web Tool allows you to sync and share data online, as well as visualize your run or bike ride free download online. You can also export data in various file formats, including the the popular . FIT for personal training and . GPX for GPS tracking.