A short review of the M3 OBD2 Head Up Display HUD device with a built in Speed Limit Alarm feature and more. This Head Up Display is a very affordable OBD2 Plug and Play device and can be installed on most OBD2 vehicles but not alll. It will also read and display the Battery Voltage of your vehicle and the Temperature. It supports both KPH and MPH and is easily changed in the settings options of the device.

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