SY Bicycle Speedometer and Odometer Wireless Waterproof Cycle Bike Computer with LCD Display & Multi-Functions The Wireless Waterproof Bicycle Computer Can Display Current Speed, Average Speed, Maximun Speed, Calories Level, Trip Distance. Setting Clock, Fat Burn Measurement, KM/hr, M/hr Selectable, Also Can Be Used as a Stopwatch. Backlight: The Bike Speedometer Has a Backlight Function, Which Available in Night Time Period Just By Clicking Any Buttons, it Will Keep for About 5 Seconds Before it Turns into White Background Automatically, Making Data Clearly Read at Night. The Computer Suitable for Most Types of Bicycles: Road Cycling, Mountain Bikes, Folding Bike, Common Bicycle and so on. Just Note That the Distance of Sensor & Magnet &lt;0.3in, the sensor & speedometer unit &lt;23.5in. Large LCD Display and Numbers Shows Clearly and No Squinting or Leaning Down Needed to Read Data, More Safe and Convenient While Cycling. The Bike Odometer is Very Easy to Install. Follow the English Instructions, You Just Need to Take a Few Minutes Install it. Any Question, Please Feel Free to Contact us.