Usage Tips:[Compatibility]: This battery disconnect switch is only suitable for the top terminal and negative terminal of the battery. batteries for cars, trucks, buses, RVs, boats, and trailers [Easy to install]: This knob type battery is easy to install and use. [Power saving ]: This blade type main switch is used for battery isolation and protection of electrical systems, eliminating any power consumption of the battery when the vehicle or vessel is not in use, stopping unnecessary battery depletion, and preventing theft or unauthorized use. This product is suitable for agricultural vehicles, buses, trucks, tractors, and motorhomes. The product is widely used and can be used as a switch key for various electrical equipment added inside and outside the car (such as flashing lights, chassis lights, cloud lights, ceiling lights, instant power-off supplies and equipment, etc.) Product name: Automobile negative power-off switch Different batches have different printed labels. There are slight differences between the actual product and the picture, which will not affect normal use. Voltage: 12V/24V Colour:Photo Color Material:Plastic + Copper Package Contents: 1 x car battery power-off switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.