Specification: Type: GPS Speedometer Material: ABS Screen Size: 3 Inch Product Size: 10.7x5.8x1.4cm/4.21x2.28x0.55 (Approx.) Input Voltage: DC 5V Working Temperature: -30~80C GPS Speed: 1 to 3 minutes Operation Guide: 1. Set the over-speed alarm rate A: Press the Up Button or Down Button to increase or decrease the speed rate B: The default alarm speed rate is 120KM/h 2. Set display mode: Press Enter button, you will see numbers 111 222 333 are shown on the screen A: 111 refers to Normal display mode, content will be shown on the screen in normal condition. B: 222 refer to Reflecting display mode, content will be shown on the screen in opposite side in order to be reflected on the windscreen correctly. C: 333 refer to Upside-down display mode, content will be shown on the screen upside-down in order to fit the specific position in the car, such as behind the front rearview mirror. (for certain vehicle models only) 3. Set the speed meter unit (KM or Mile) A: Long press the Enter button, if you see number 100 shown on the screen, which means KM/h B: Long press the Enter button, if you see number 161 shown on the screen, which means MPH C: The default speed meter unit is set as KM/h Package Included: 1 * GPS Speedometer 1 * Bracket 1 * Charging Cable