The LCD screen allows you to easily read your statistics Small size, light weight, wireless and waterproof, making it practical and durable. It allows you to measure speed, distance and travel time. The serious cyclist or fitness fan can track their time in the saddle and distance covered LCD backlighting to distinguish day and night. Easy to install Wireless and waterproof design makes it more convenient and durable. Please note that the slight clicking sound of the device is a normal phenomenon, it is the result of the wireless auto function design. The screen will go to sleep mode with LCD display if no signal will be entered in 300 seconds. Memory function. This bike computer automatically wakes up when you shake it or any signal is input or any button is pressed. The auto wake-up function of this wireless bike computer: built-in ball switch, makes vibrate the watch body after sleep and automatically turns on once the ball switch detects the vibration Material: ABS engineering plastic electronic components Display: LCD screen Size: 4.6*4.6*1.9cm Weight: about 90G Power supply: 1 CR2032 button cell in the measuring head; 1 12V 23A battery in the transmitter Configuration: head*1, wireless rotating base*1, magnet*1, cable tie*4, rubber ring*1, manual*1, wireless transmitter*1 Color: Black Backlight: Green/White Delivery quantity: 1 piece luckymeet Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-WuhanGQ shop 3