Method: Green knob type, easy to install and easy to use. Loosen it to power off, and tighten it to power on Specifications: with 1 M8*30mm long bolt, 2 brass tinned terminal blocks (MAX: 5AWG/16mm), switch for 0.62"~0.66" (15.8~16.8mm) negative pole terminal, 12V DC system, Rated current 125A, peak current 500A, on/off 2 positions. Applicable: Used for battery isolation and protection of electrical systems, suitable for cars, boats, RVs, trucks, motor boats, racing cars, UTVs, MPVs and other scenarios. Before installation, check whether the negative pole of the battery and the battery clip (original battery connector) are corroded (white powder) or cleaned (to prevent poor contact between the battery and the battery switch), and then install a new battery switch. Function: It can eliminate the dependence and consumption of the electrical system on the battery when the power supply is not used for a long time, and effectively avoid the feeding situation caused by the long-term non-use of the power supply. Model: The switch is made of zinc alloy and copper-plated, and the knob column is made of brass, which is strong, rust-proof and corrosion-resistant, with strong electrical conductivity and stable current. Is your battery dead or do you need to store your car without draining the battery? In this super easy DIY battery kill switch, you'll learn how to solve the problem with a basic universal battery disconnect switch that you can install in under 5 minutes and cost almost zero!