Features: High quality: rust, corrosion resistance, guard the power supply from water leakage, water, durable, safe to use. Safety: The battery isolation switch helps isolate and guard the electrical system, eliminating any vehicle or boat that draws power from the battery when not in use, and safely disconnecting the battery. Extend battery life: Quickly disconnect the circuit, prevent leakage current and battery loss, and extend battery life. If you have a lot of car appliances installed in your car such as stereo/TV, etc., the car battery switch off will be a good choice for you, because it can effectively power off for you. Easy installation: Easy installation does not require any tools, and it takes one hour to install the battery switch on your vehicle. The keys are ergonomically designed to fit the thumb perfectly and easily Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Size:As Picture Shown Package List: 1*300A Car Knob Power Off Switch