Take your training to the next level with a Bluetooth heart rate monitor chest strap. Easily pair the Bluetooth chest strap to your LifeSpan TR3000i, TR4000i or TR5500i treadmill (2019 models only) to enjoy the benefits of heart rate training without having to use the built-in heart rate sensors on the handlebars. The heart rate monitor utilizes the latest Bluetooth 4.0 technology, delivering precise readings and displaying them on your treadmill console. Plus, the chest strap is 80% nylon and 20% spandex, making it comfortable enough to wear throughout your distance runs. And when your workout is complete, the connector piece can be removed from the strap in a snap for easy cleaning.