1Compatibility: Compatible with most Obd Ii memory protectors on the market today (or car computer memory protectors). Use it to power your Hud without plugging in an Obd port (Hud usually plugs into an Obd port for power). 2Keep Car Computer Memory: Avoid information loss when car computer power off, including dashboard information, digital clock, audio, memory seat, Abs, anti skid system, electric rearview mirror. 3Suitable For 24V Dc Power Supply: Cigarette lighters can hold vehicle codes, electronic presets, and radio messages. This device can use any 24V Dc power supply, including jump starter, Dc 24V lead acid batteries or other automotive Dc 24V power outlets. 4Male Obd End Cable Required: This cable is a 24V female Obd outlet adapter. The female end cannot be plugged into the connector on the car. A male Obd end cable is required. 53 Meter Extension Cable: Our cable is 10 feet (3 m) in length. When you don't have a starter on hand, you can either replace the car battery or get an alternative 12V power supply from another car.