Heart rate belt for ANT+ and Bluetooth Smart The water resistant heart rate belt by Tacx is one of the few sensors that communicates wirelessly via ANT+ and Bluetooth Smart. This means you can use it in combination with many other devices, such as a sports watch, sport applications on a smartphone and a tablet, a Garmin device and a Tacx trainer, making performance tracking a lot easier and more fun. The sensor transmits your heart rate information wirelessly via ANT+ and Bluetooth Smart technology. You can use the Heart rate belt with the Tacx Smart trainers, but also when cycling outside or doing other sports such as running and fitness.