This is the Viofo OP100 OBD-II constant power adaptor with USB-C parking mode cable.

The OP100 is designed to power dash cams and mobile devices through the vehicle's OBD-II port. Compared to typical car power supply methods as the cigarette lighter socket and hardwiring, this method excels in many aspects. 

Installation is easy

Plug and play has never been easier. Simply plug the constant power adaptor into the vehicle's OBD-II port and connect it to your VIOFO dash cam via the included USB-C cable. Your dash cam will receive constant power, even when your vehicle is off.

The constant power adaptor will protect your vehicle battery by shutting down within 90 seconds if it detects the battery voltage is less than 12V, preventing the car's battery from draining and ensuring the car can restart normally.

Dual Output Ports

OP100 comes with two output ports, one that is prioritized for powering the dashcam, the extra Type-C port is a huge bonus to power a mobile device.