SM001 Digital GPS Speedometer with Real-time Driving Speed Record, Overspeed Reminder, Battery Voltage Measurement, 24 Hours UTC Local Time Display, Snap-in Installation with Waterproof Design. GPS SPEEDOMETER ----- When the GPS positioning system receives satellite signals, the speedometer displays real-time driving speed values and UTC local time. The number of satellites can be viewed. Real-time speed measurement range: 0-999KM/H, 3 speed units can be selected: KM/H,MI/H,NMI/H; UTC time compatible for mat: 24 Hours. MAX SPEED & OVERSPEED ALERT ----Record the maximum speed while driving, and the maximum speed can be reset; overspeed reminder has three modes: 0-999KM/H,0-620M/H,0-50NMI/H, when the warning value is reached, the red light will flash as a reminder. BATTERY VOLTAGE ---- When connecting an external power supply, you can view the current battery voltage value through operations. The working voltage is: DC10-24V. EASY INSTALLATION ---- Snap-in installation saves time and efcompatible for t, easy to install. OTHER ---- Refresh rate can be set; Waterproof rate: IP65; CE RoHS certification; 2-years warranty. Product Functions: 1. Speedometer When the GPS positioning system receives satellite signals, the LED screen will always be turned on and the driving speed will be displayed in real time. The number of satellites display are 0-12pcs. The maximum speed can be checked by operation, it can be reset; The maximum recorded driving distance:0-99999KM/H. 3 speed units can be switched compatible for use: KM/H,MI/H,NMI/H. Refreshrate:0.5S/0.2S 2. Overspeed Reminder When the warning value is reached, the red indicator light will flash. 3 overspeed warning modes: 0-999KM/H, 0-540NMI/H, 0-620MI/H. 3. UTC Local Time & Battery Voltage Measurement Display 24 hours UTC local time once the GPS system receives the satellite signal. Displays the voltage value of the battery when an DC10-24V power supply is connected. Voltage accuracy:0.5%. 4. The Definition of Indicator Light Green light flashing: Not positioned Green light on: Positioned Red light on: Overspeed remind 5. Others Product size: 64.5x66mm Display mode: 37x31mmLCD Product weight: 150g Waterproof rate: IP65