Multifunctional wireless bicycle speedometer includes all vital functions for novices and pros alike. Realtime display of the current speed odometer trip distance maximum speed average speed elapsed time clock etc. Engineering plastic and electronic components material with LCD good durability and have a clear view of the data. Imported sensors to provide stable performance and accurate speed. Battery: 1 x CR2032 button battery 1 x 23A - 12V F23 battery in transmitter(Included)