Thanks to the swivel connection, the switch can be connected to the battery separately. The pole clip is fixed on the negative pole of the battery with screws. Turn on the rotary wheel (red) to interrupt or turn on the power. This allows you to disconnect the battery from the power source without unscrewing it. This also works well if your car isn't used for an extended period of time. This also provides a very simple and effective anti-theft device. Size: 59*32mm Interface diameter: 15.5mm-17mm Weight: 116g Material: Zinc alloy plated brass Color: red, black Quantity: 1pcs Package includes: 1*Power off switch - The battery can be disconnected without tools. - With quick release screws. - Avoid leakage current. - Also acts as an anti-theft device. The battery can be disconnected without tools. With quick release screws. Avoid leakage current. Also acts as an anti-theft device.