Features: Water-resistant: you can enjoy your riding with it even in rainy days (Don& 39;t soak it in water). BLUETOOTH 4.0 TECHNOLOGY: This device is a Bluetooth Smart and ANT+ device, widely compatible with smart devices with Bluetooth 4.0 LOW-POWER: This item powered by 1 * CR2032 cell battery and can last about 12 month. Bluetooth Technology. speed cadence distance amount can be shown on your mobile phone Accurately monitors bike speed,bike cadence,distance. Description: Compatible with almost all of these smart phones, so you have no need to worry about your phone is not compatible When you are riding, cycling speed, cadence and distance data will be all shown on your smart device. Easy to fit and operate Specification: Material: plastic Color: black Battery lifespan: 500 h Battery type: Button cell CR2032 Transmission distance: