CCbetter&reg; Wireless Bicycle Computer Dual Sensor supports Pedal Cycle Calculation with Bright Backlight and Calories Monitoring Function Black Non Noise Before use this cycle computer, it need to pair the transmitter and the computer. The procedure is install transmitter battery - install computer battery - setting computer - pair the transmitter and computer. If it fails to pair, please try agai Can be set language(English/Chinese), KM/m, Bike A/B, Wheel Size, Distance, Time, 12/24H, Female/Male, Age, Height, Weight, etc. Easy to operation, press LEFT button to switch all the display mode, from CLK, stopwatch, trip dist/time, avg/max speed, calorie, CO2, TEMP, total distance/time, scan and memory mode. EL backlight, in any mode, both press LEFT and RIGHT button to turn on/off the backlight. This cycle computer is with wireless cadence, which can calculate your frequency of pedal bike.