The Tacx Heart Rate Strap Smart T1994 is a waterproof heart rate strap used for various ends. With Bluetooth Smart and ANT+, it'll send your data to your smartphone, tablet, or other compatible device. That means your workouts will become even more efficient than they already were. You can effortlessly place the heart rate strap around your chest with the included soft strap. The soft material prevents skin irritation, lashes, and scrapes, so you can push it to the limit.