The Bicycle Computer with functions is ideal for cycling enthusiasts. Features: Track and display speed,time,distance and multiple datas in data instantly. LCD screen for clear reading during cycling. Rainproof body allows for light rainy days. (Do not soak into water for long time) Made of premium ABS material,durable and practical. The assembly is very easy and it requires no tool. Functions: SPD: Current Speed ODO: Kilometer Counter DST: Trip Distance MXS: Maximum Speed AVS: Average Speed TM: Elapsed Time CLK: Clock +"-"Comparator Speed Scale (km/h,m/h) Set Tires Outline: 0mm-9999mm Set The Last Value of Coilometer Counter/ODO Auto ON/OFF Alert Maintenance Specification: Material: ABS Size: 5.0*4.5*1.5cm/2.0*1.8*0.6in Power source: 1* 1.5v 80mAh LR1130 battery (included) Package List: 1* Bike Computer 1* Mount 1* Sensor 1* Magnetic Screw 6* Fixed Straps 1* LR1130 Battery 1* Instruction NOTE: Please test the bike computer which should be installed on the mount with the magnetic screw,if there is no any data display,please