<p>Product Description Material: ABS Size: 4.6 * 4.6 * 1.8 cm Color: Black Display: LCD Display Backlight: Green\/White Function: Wireless Automatic Wakeup Power Supply: Meter Head 1 CR2032 Button Battery; 1 12V 23A battery for transmitter quantity: 1 Package content: 1 * Bicycle 1. Automatic wake-up function automatically wakes up from sleep mode when sensing bicycle vibration. The bright LCD display makes it easy to view driving statistics information. 2. Multifunctional. Small size, light weight, wireless, waterproof design, convenient and durable. This bicycle computer measures speed, distance, and riding time. This is the statistical data that any serious cyclist or fitness enthusiast needs to know. 3. The day and night backlight provides backlight during dark hours for easy viewing. When any button is pressed between 18:00 and 06:00, the backlight will automatically turn on. Please note that a slight creaking sound from the device is a normal phenomenon, which is the result of the wireless automatic function design. 4. Easy to install and use, simple installation takes only a few minutes. Easy to navigate interface with only two buttons to access all measured values. Customization can be made based on the most common tire sizes to accurately track statistical data. 5. Bicycles, mountain bikes, folding bikes, and other common bicycles are all compatible with this bicycle computer. This bicycle computer may not be compatible with some electric powered bicycles. If computer monitors, sensors, and magnets can be installed within a specified distance, the device should be fully compatible.</p>