Features: Universal for street roads, RVs, trailers, vehicle, engineering/agricultural machinery which a battery cut off switch is required. Waterproof,durable,and easy to control: Ensures the vehicle electrical system reliability and stability. Zinc alloy for case housing with copper contact. Eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely. Eliminate any power draw from the battery when your Vehicle or Boat is not in use, disconnects the battery safely. The rear cover insulates the rear terminals against any short circuits. Safe and efficient, Tin-Plated copper studs and nuts, Ignition protected, simple to install, universally used for Cars, battery powered Vehicles, RV and Boat, also used for electrical equipment's switch. Specifications: Material:Aluminum Alloy + Copper Size:Approx.6.8x11cm/2.67x4.33inch Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1 Set Isolator Switch