Feature:1. WATERPROOF PERFORMANCE: With high waterproof performance, allow a short time to be washed by light rain or heavy rain, but do not be drenched in rain for a long time.2. LCD SCREEN: Comes with a large touch screen, easy to read, which gives you guarantees that you can read your statistics easily.3. AUTOMATIC WAKE UP: When the light dims, the backlight automatically lights up. Built in automatic wake up function, which will not lost the riding records.4. WIRE CONTROLLED KEY: Easy to operate, which means that your hands do not need to leave the handlebars and you can switch the functional interface at will.5. WIDELY USED: Lightweight design make it suitable for most types of bikes, such as road bikes, mountain bikes, folding bikes,and other common bikes.Specification:Item Type: Bike Speed MeterMaterial: PlasticBattery Model: 2 x CR2032 (not include).Package List:1 x Header1 x Inductor Line Control Button1 x Magnet6 x Cable Tie1 x English Manual