Sprotsrain SD-548B LCD Computer Odometer Sport Cycle-Waterproof Outdoor Wired Speed Meter Multifunctional - for Mountain Bike Cycling (Black) It is made of plasticwired ,Portable, compact, light and easy operation, multi-function with LCD. Multi Functions record cycling data from several aspects, all-round; and truly, scientifically arrange cycling life It has many functions as SPD, Maximum Speed. Average driving speed. And the average speed of contrast prompt. Every minute wheel run circle number (inch / metric switch) .Odometer (Total Distance). DST - Trip Distance, etc. Computer Odometer Sport Cycle has Waterproof functions with back light. You will not worry it will out of work in the rain. Easy view of the maximum speed, average speed, total riding time, total riding distance and rotations per minute of the wheel. Options of 14h/24h systems, stopwatch feature and alert feature for bicycle maintenance. Length unit options of kilometer/mile. Imported sensors to provide stable performance and accurate speed. Real-time indication of acceleration or deceleration for easy control speed.