The EverStart 936W Terminal Disconnect installs on your marine battery and makes connecting and disconnecting power quick and effortless. Once installed turn the green knob counter-clockwise to shutdown power or clockwise to connect power. This product is perfect if your regularly connect and disconnect power to your vehicle s or boat s battery. This terminal disconnect is made of brass-plated alloy and fits on both positive and negative posts. It s also compatible with 12-or-24 vehicle dynamic control systems. Coleman Cable Inc. is a leading manufacturer and innovator of electrical and electronic wire and cable products for the security sound telecommunications electrical construction retail commercial industrial irrigation HVAC and automotive markets. Coleman Cable Inc. offers a family of leading brands such as Designers Edge Fire Shield and Woods.