Features: 1. The dual transmission system (ANT+ / Bluetooth) compatible with both widely used ant+ and Bluetooth smart devices. 2. An easy-to-install, weatherproof, lightweight, wireless design which can simply attach the weightless sensor and ride. 3. These sensors are easy to install, maintain and move between bikes. 4. A water-resistant and long time of operating time make our sensor environmental friendly and convenient to use. 5. Can be used to support Bluetooth 4.0 protocol and ant+ protocol for riding apps, riding software, code tables, sports watches, etc. 6. The signal is stable and the data is accurate. Even if the road is bumpy, the data is stable. Specifications: Color:Black Size:21x8cm Weight:4g Waterproof level:IPX7 Battery:CR1632 Rated Voltage:3.0V Using time:300 hours Standby Time:300 Days Connection Mode:Bluetooth4.0, ANT+ Support Object:Cycling APP,Bike Trainer,Stopwatch,Sport Watch,etc. Measuring Range:0-200rpm Package included: 1x Cadence sensor(Battery included) 1x Battery 3x Elastic 2x Outdoor double-sided tape