brand new and high quality Features: With this speed sensor,you can see your cycling speed data by connecting this sensor with any device that can support Bluetooth-compatible 4.0 or ANT+.It is an awesome tackle that fit for professional cycling enthusiasts. You can adjust your exercise level according to data from this sensor.Wireless with Bluetooth-compatible and accurate design will make your cycling more effective and smooth!Waterproof and long using for time,by the way,simple device that will be convenient for you! It can improve the efficiency and reduce the sports injury by keeping the cadence in the reasonable range(90-100rpm).Moreover,it is better to install it on the pedal frame. Specification: Material: Plastic Type: Round Color: Black Waterproof: IPX7 Connection Mode: Bluetooth-compatible 4.0,ANT+ Multi-protocol Measuring Range: 0-200rpm Standby Time: 300 Days Using TIme: approx.300h Rated Voltage: 3.0V Support Object: Cycling APP,Bike trainer,Sport Watch,etc. Size: One Size Diameter: 20mm(0.79in) Power Supply: 1 x CR2032 Button Battery(included) Quantity: 1 Set(1 set of speed sensor only,other accessories demo in the picture is not included!) Note:1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes(without retail package): 1 Set x Speed Sensor