... arriving, press the lower key on the controller, lock arm down, let it in.2) when left ... , press the upper key, raise the lock arm, locking the parking space.3) Reserve parking ... : 12V 7AHApplication of Vehicle Parking Lock 1) Parking lots in real estate,2) Hotel, Airport, 3) Factory, 4 ... ) Office Building, etc. Goldantell car parking lock , factory price, ...