Brand Name: CYSTAROrigin: CN(Origin)Wire or Wireless: wiredSize Name: 73x68x46 mmOutput Frequency: P10 OBDII Hud OBD2 Smart Digital Meter T600 GPS HUD Head up displayRated Power: P10 OBDII Hud OBD2 Smart Digital Meter T600 GPS HUD Head Up DisplayT600 GPS Speedometer Display: Speed, Time, Voltage, Instant Travel DistanceP10 OBD Speedometer Display: Speed, RPM, Water Temperature,Voltage,Fuel Consumption, Coolant, OdoGPS Speedometer Disadvantage: Can't show fuel mileage and other obd dataOBD Speedometer Disadvantage: Oonly works with latest cars with obd2 portGPS Speedometer Advantage: Wide apply for all vehiclesOBD Speedometer Advantage: Could read all engine data as long as the engine protocol openOn-computer Speedometer: GPS HUD T600