The Polar Wearlink Bluetooth transmitter set incorporates a soft textile chest strap that is made from a hand wash textile that seamlessly adapts to your body allowing for full freedom of movement when training. The device has a Polar WearLink(R)+ transmitter and utilises the Bluetooth(R) wireless technology to transfer your heart rate signals to your mobile device with a compatible training application. The transmitter features a hook mechanism that makes it quick to put on and take off. The device also has a water resistant connector and is powered by a user replacable battery.