Product name: Automobile negative power-off switch Material:Plastic + Copper Product size:10.4*3.7cm(4.09*1.46in) Voltage: 12V/24V Color:As shown Weight:About 145g Package Contents:1Pc car battery power-off switch Description [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 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.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.