XOSS Cadence Sensor track the cadence and speed by earth induction, NO need MAGNETS, light weight and easy to install, the working time can reach 400 hours,can be used continuously a year if you ride 1 hour per day. Support BT and ANT+, works with phone via BT. Not only use it as cadence sensor, but also as speed sensor. Features: XOSS Cadence Sensor track the cadence and speed by earth induction, NO need MAGNETS. Light weight and easy to install. The working time can reach 400 hours,can be used continuously a year if you ride 1 hour per day. Support BT and ANT+. Not only use it as cadence sensor, but also as speed sensor. Specifications: Material: ABS Color: Black Standby Duration: 400hrs Operating Temperature: -20~50 Waterproof: IP67 Technology: for BT 4.0LE(Low energy), for ANT + Transmission: Wireless Battery: 1 * CR2032 (Included) Virtual Trainable APP: ZWIFT, BKOOL, TACX etc. Sensor Size: 35 * 27mm / 1.37 * 1.06in Sensor Weight: 9g / 0.32ounce Package Size: 130 * 100 * 50mm / 5.1 * 3.9 * 2.0in Package Weight: 50g / 1.76ounce Packing List: 1 * Bike Cadence Sensor 4 * Rubber Band 2 * Silicone Gasket