H400G Car 3.5 inch GPS Mode HUD Head-up Display Support Speed / Time / Distance Display, H400G Battery & Resistance Tester and the other for reverb

and the other for reverb volume

4GHz band)

output without sound amplify function

Built-in powerful magnets

check machine code more secure

H400G Car 3.5 inch GPS Mode HUD Head-up Display Support Speed / Time / Distance Display, H400G Battery & Resistance Tester and the other for reverb1. Using 10 Hz high refresh rate GPS + Beidou dual mode chip, the refresh rate is 10 frames per second. The vehicle speed refreshes quickly without delay. 2. Using car USB (5V) or cigarette lighter to USB power supply, truly zero power consumption. USB or cigarette lighter is a short power, the car is turned off and the power is cut off, there is no the phenomenon of power stealing, and OBD is a long power. 3. Add the speed calibration function, which