Polar H10 Heart Rate Sensor Connects with Bluetooth, ANT+ and 5 kHz Several connections can be active simultaneously Built-in memory for one training session Waterproof up to 30 m Software updates Machine-washable textile strap I bought this to track my heart rate but I got a watch for my birthday that I like. You can use both, I just don't care to. The strap is clean, sanitized and free of blemish. The system was easy to connect to my phone (Bluetooth can be annoying, but it worked the first time I tried it) The data is really easy to read and understand and the platform is very easy to navigate