Features: 1.Stonego Speed Warning Function: When the driving speed is more than 20km/h, the speed indicator will flash, less than 20km, the flashing indicator will stop, provide accurate cycling data, more scientific and reasonablemanagement of your riding life. 2.Multi-function: Small size, light weight, waterproof design makes it more convenient to use. With all the basic functions, speed contrast reminder function, maintenance function, fuel reminder function, battery low voltagereminder function, sleep mode, light-controlled LCD backlight, backlight long light function, clock, temperature etc. 3.Practical and Convenient: with our support, you can easily install, adjust and move your computer manually. Spend less time setting UP your equipment, avoid the inconvenience of the route, and have more time on theroad. Specification: Material: Engineering Plastic Product Size: 57 x 40 x 17mm Screen Size: 34 x 31mm Package include: 1 x Wired bike speedometer 1 x Transmitter sensor 1 x Magnet 6 x Cable ties