Accurately polarity markings on the housing help in proper wiring, making it impossible to connect the wrong polarities to one another. Simple and easy for installation. | The grip on both sides of the plugs together to ensure a vibration-proof connection but can be easily disconnected for quick removal for charging of the battery. | Made of sturdy housing allows for battery quick connect/disconnect from winches, trailers, or other electrical devices more than 10,000 times. |