Thinkware OBDTH01 OBD-II Plug and Play Power Harness features an OBD-II plug and socket, allowing it to plug in-line with the vehicles OBD-II port. This enables other OBD-II devices to be connected to the vehicle while the dash cam is connected, providing a seamless and discreet installation solution for your Dash Cam. The included ignition module as a power off delay feature providing consistent accessory power during varying vehicle conditions, such as engine shut-down at a red light or alternator disengagement while driving. This feature is essential for vehicles with stop-start technology. Instead of connecting 3 wires to the vehicle fuse box, the OBD-ii harness simply connects to the obd-II port in the vehicle, providing plug and play installation. Once connected, access to the parking surveillance mode on your thinkware dash cam will be enabled, just as if you had hard wired the dash cam using the hwc hard wire kit.