DescriptionModel Number : C406Stopwatch and Accessories : Wireless StopwatchCertification : CEH64 Heart Rate Monitor1. Long battery life2. ANT+ & Bluetooth 4.0 support3. Compatible with garmin , igpsport, ZWIFT , WAHOO , STRAVA and so onPackage list1. ANT+ & Bluetooth 4.0 Heart Rate Sensor1 CR2032 Battery1 Adjustable elastic strapS3+ Cadence and Speed dual sensorProduction details:1. Dual Transmission System (ANT+ / Bluetooth) Compatible With Both Widely Used ANT+ and Bluetooth Smart Devices 2. Easy-to-install, Weatherproof, Lightweight, Wireless & No Magnet3. Speed & Cadence 2 in 1 Sensor (If need track Speed & Cadence at the same time, you need to buy 2 units)4. Compatible With Garmin, Bryton GPS Cycling Computer with ANT+ System5. Also compatible with indoor cycling platform such as Zwift, Sufferfest, TrainerRoad and your favorite indoor. Also works with the free Wahoo Fitness app, Strava, RideWithGPS, MapMyRide, Cyclemeter, and more