【Auto Wake-up Function】Automatically wakes from sleep mode upon sensing vibration in the bicycle. Bright LCD display to easily view ride statistics.<br>【Day &amp; Night Backlight 】Provides backlight for easy viewing during dark hours. The backlight will automatically turn on when any button is pressed between 18:00 and 06:00. Please note the slight rattle sound from device is normal phenomenon, which results from the design of wireless automatic function.<br>【Multi-functions】Small Size, Light Weight, Wireless &amp; Waterproof design make the bicycle odometer more convenient and durable. It works well to Measure Speed, Distance and Riding time, especially suitable for cycling or fitness enthusiasts.<br>【Applicable】Road bicycles, mountain bikes, folding bikes,and other common bicycles are compatible with this bicycle computer. This bicycle computer MAY NOT be compatible with some electric-assist bicycles. If the computer display, sensor, and magnet can be installed within the specified distances device should be fully compatible.<br>【Easy to Install &amp;Use】Simple installation that only takes a few minutes. Easy to navigate interface with only two buttons to access all measurements. Customizable to most common tyre sizes for accurate stats tracking.