Wireless Bike Computer, Waterproof Bicycle Computer with Backlit LCD Display Speedometer Bike Meter and Odometer Cycling Stopwatch - LCD screen allows you to easily read your stats Small size, light weight, wireless and waterproof, making it convenient and durable. It measures speed, distance, travel time. The serious cyclist or fitness enthusiast can track their time in the saddle and distance traveled LCD backlight to distinguish day and night. Easy to install Cordless and waterproof design makes it more convenient and durable. Please note that the slight clicking sound from the device is a normal phenomenon, it is the result of the wireless automatic function design. The screen enters sleep mode with LCD display if no signal is input for 300 seconds. Memory function. This bike computer will automatically wake up when you shake it or any signal is input or any button is pressed. The automatic wake-up function of this wireless bike computer: built-in ball switch, makes the clock body vibrate after sleep mode and automatically turns on when the ball switch senses vibration Material: Engineering Plastic ABS Electronic Components Display: LCD Screen Size: 4.6*4.6*1.9cm Weight: about 90G Power Supply: 1 CR2032 button battery in the measuring head; 1 x 12V 23A battery in the transmitter Configuration: main unit*1, wireless rotating base*1, magnet*1, cable tie*4, rubber ring*1, manual*1, transmitter without yarn*1 Color: Black Backlight: Green/White Scope of delivery: 1 piece Note: The data is manual measurement, please allow 1-149 cm error, due to light and screen differences, there will be some color difference, the specific received in kind shall prevail.