1Function: Switch the isolated battery pack to all loads, or combine the battery pack to all loads, first on and then off contact design, allowing switching between battery packs without interrupting power. 2Power Saving: The battery circuit shut off switch help eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely. 3Material: Tinned copper studs offer high electrical conductivity and rust proof, wear resistant, ignition protection, and one piece binding post design will not loosen over time. 4Practical: This battery isolator switch is used for 32V Dc systems to isolate and secure the electrical system, to achieve safe switching between batteries, loads, and charge sources. 5Wide Application: This black battery disconnect switch is applicable for marine, Boat, Rv, with 3/8in terminal stud size, adaptable for M10 screw.