Compact appearance design, multi-function bicycle computer is durable, economical and practical. Features:Small in size and light in weight, wired and waterproof design make it convenient and durable.Multi-functions: the computer measures average speed, maximum speed, distance and riding time etc, to keep track of your Cycle effectively.300 seconds without signal input, screen display will enter standby mode, clock retention.If there is a traffic signal input or press any key, it can revert to the shutdown mode and memorise the data before shutdown.Powered by a LR1130 button battery (note: the battery is included). Specifications:Material: ABSColour: BlackPower: a LR1130 button battery (included)Size: 51 * 42 * 18mm / 2 * 1.7 * 0.7inWeight: 56g / 2oz Functions:OdometerSpeed Average SpeedMaximum SpeedTrip DistanceAuto On/OffElapsed TimeSetting Speed ScaleSetting the Last Value of OdometerSetting Tire CircumferenceClockComparatorScanFreeze Frame MemoryMaintenance Alert Package List:1 * Computer1 * Mounting Base1 * Wired Sensor1 * Magnet6 * Ties1 * User Manual