Auto Wake-up Function: Automatically wakes from sleep mode upon sensing vibration in the bicycle. Bright LCD display to easily view ride statistics. Multi-functions: Small size (46*46*18mm), lightweight, wireless, waterproof design makes it convenient and durable. This bicycle computer measures speed, distance, and riding time. Suitable for serious bicyclists or fitness enthusiasts for stats tracking. Day & 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. Note: Slight rattle sound from device is normal due to wireless automatic function design. Easy to Install & Use: Simple installation that only takes a few minutes. Easy to navigate interface with two buttons to access all measurements. Customizable to most common tyre sizes for accurate stats tracking. Color: As shown in the picture. Applicable to road bicycles, mountain bikes, folding bikes, and other common bicycles. May not be compatible with some electric-assist bicycles. Ensure sensor, magnet, and display are installed within specified distances for compatibility.