Usage Tips:[ Compatibility ]: This rotary battery disconnect switch is only suitable for the top terminal and negative terminal of the battery. Maximum current: 500A, rated current: 100A. 6v 12v 24V batteries for cars, trucks, buses, RVs, boats, and trailers [ Top Heavy Duty ]: This rotary battery disconnect switch is made of High-quality materials, which is -, has good conductivity, is , and safe to use [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. [ Widely Used ]: Widely used in batteries for cars, trucks, ships, or RVs, it can also be used as a key for various electrical devices added inside and outside the car (such as flashing lights, chassis lights, fog lights, roof lights, outage equipment, etc.) Note:Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Black Material:plastic Package Contents: 1 x Universal Car Battery Disconnect 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.