Wide compatibility Car battery link terminal widely used in batteries for autos, vehicles, RVs, ATVs and boats, and suitable for electrical equipment. Easy operation Shutoff switch is easy to use. Tighten the screw cap 45 turns to turn the battery on; loosen to turn off. Provides strong reliability for safe use. Purpose Enables battery isolation and supports fixed electrical systems to eliminate any power consumption and safely disconnect the battery when the vehicle or boat is not in use. Important usage note Always turn off your vehicle before disconnecting the battery to prolong the life of the battery, electrical components, and the disconnect switch. Avoid random power cuts to prevent damage to the locking navigation system and other anti theft features. Key attributes Function: battery isolation and power control via a shutoff switch Compatibility: autos, vehicles, RVs, boats, ATVs and related electrical equipment Operation: on/off via tightening or loosening the screw cap (45 turns to ON) Performance: reliable operation and safety for everyday use Use scenarios Long term storage of cars, boats, RVs, or ATVs to prevent battery drain Isolating the battery during maintenance or installation of electrical equipment Securing a vehicle or boat in storage to avoid parasitic power loss and protect electronic systems