The All New Zonore Wireless Bicycle Speedometer With this Zonore bike computer, you can manage your riding life morescientific and more reasonable. Furthermore, we provide a more concise andbrief user manual and installation instruction. Therefore, using bike computerwill be simpler for you. Please note the slight rattle sound from device is normal phenomenon, whichresults from the design of automatic function.Built-in steel ball switch thatwill shake when receiving signals, computer will be automatic awake fromsleeping mode. Meanwhile you may hear slight rattle from the device. It’scommon phenomenon as steel ball is working. Functions: Record traffic speed (SPD) Record the total traffic mileage (ODO) Record the single lane mileage (DST) The maximum driving speed (MXS) Show driving average speed (AVS) Show driving time (TM) 12 / 24-hour clock (CLK) Automatic circulatory function (SCAN) Comparison prompt (“+” “-“) Miles set (KM / hr, M / hr) The tire circumference is set (SET) The total length of the initial value setting (SETTING TYRE CIRCUMFERENCE) Driving data sampling function (FREEZE FRAME MEMORY) Maintenance reminder function (MAINTENANCE ALERT) Switch: automatic awake from sleeping mode (AUTO ON / OFF) Specifications: Dimensions:464620mm, Weight:85g Battery:3V/ CR2032&12V/23A Screen: LCD display Package Includes 1 Computer 1 Magnet 1 CR2032 Battery 1 Sensor 7 Cable tie 2 Stickers 1 Instruction