Features : 1. Multifunctional - This bike computer has all the basic functions,for example current speed, average speed, MAX speed, ride time, etc. 2. Wireless and waterproof -Good waterproof performance allows you to enjoy cycling in any weather.performance.The wireless design also avoids complicated wiring and makes installation easier. 3. LCD backlight and wide suitable -It will ensure that you are safer to ride at night in places with poor lighting.Can be installed on most types of bicycles. 4. Simple installation with instruction book -There are no complicated installation steps and settings.Read the instructions carefully and you will use thg bike computer easily. Specification : 1. Name: Bicycle waterproof GPS wireless speedometer 2. Waterproof: IPX7 3. GPS: High sensitive GPS 4. Screen: 1.8inch LCD screen, high contrast 5. Automatic backlight, easy to read includes:1 x Speedometer