Item Type: Bike Speed Meter Material: Plastic Battery Model: 2 x CR2032 (not include) Package List 1 x Header 1 x Inductor Line Control Button 1 x Magnet 6 x Cable Tie 1 x English Manual 1WATERPROOF 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. 2LCD SCREEN: Comes with a large touch screen, easy to read, which gives you guarantees that you can read your statistics easily. 3AUTOMATIC WAKE UP: When the light dims, the backlight automatically lights up. Built in automatic wake up function, which will not lost the riding records. 4WIRE 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. 5WIDELY USED: Lightweight design make it suitable for most types of bikes, such as road bikes, mountain bikes, folding bikes,and other common bikes.