Train outdoors, indoors or even online with the Garmin Dual Heart Rate Monitor Transmitter. In addition to ANT+ connectivity, this comfortable, soft strap heart rate monitor transmits real-time heart rate data over BLUETOOTH wireless technology. Connect with third-party training apps from phones or tablets such as Zwift, GPS watches, bike computers & even the compatible fitness equipment in your favourite class at the gym, plus your Garmin GPS watch or bike computer. Train year-round, & get the accurate, real-time heart rate data you need to take your performance to the next level. Replaceable CR2032 battery. No cross-talk with other devices to reliably measure & send heart rate data to help you train in your zone. Removeable measurement pod allows for regular washing of the strap to keep your system hygienic.