Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si : Speed over the ground TRIP: Single mileage, reset after power failure ODO: Accumulated mileage, save when power off COG: heading, clockwise of Navigation pointer: 8 directions. Can freely switch kont, mph, km/h speed unit Working environment: Working voltage: 9~32VDC Working current: Less than 120mA Working temperature:-20~70 Celsius Storage temperature:-30~80 Celsius Input parameters GPS signal:GPS antenna length is 3 Connection 1.Black wire: negative pole of power supply (-) 2.Red wire: 9~32VDC Colour:White+black Material:ABS Package Contents: 1 * GPS Speedometer 1 * GPS Antenna 1 * Instruction manual Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.