Features:Multifunction: Speedometer， odometer， trip distance， trip time， average speed， max speed and speed tendency.Imperial / Metric unit setting.Digital clock: 12 / 24H format.Auto shut off: if item is left idle for 5 minutes.Clear big LCD display， easy to read.Easy installation， no tools required.Dual power source: solar panel and AG13 battery.Good assistant for bicycle training.Specifications:Power source: Solar panel and AG13 batteryDimensions: 7.5 * 4 * 1.5cm / 2.0 * 1.6 * 0.6inLCD Screen: 2.7 * 2.2cm / 1.1 * 0.9inPackage size: 9 * 6 * 4cm / 3.5 * 2.4 * 1.6inPackage weight: 73g / 2.6ozPackage List:1 * LCD Bicycle Computer with Bracket and Transmitter1 * Magnetic Screw and Spoke Clamp4 * Cable Ties1 * User Manual (English)