Features: Ensure the safety of your battery with this replacement key for battery main switches. Made from durable plastic, it provides reliable power control for trucks and boats. Designed for easy installation and operation, this compact key provides space saving convenience. Its high quality materials ensure long lasting use. Suitable for truck and boats owners, drivers, and maintenance professionals, this key effectively cuts off power supply to prevent battery leakage and over discharge. Improve the lifespan of your battery effortlessly. From marine adventures to long transportation, this switch key ensures secure power management. It offer peace of mind during battery maintenance and replacement. Upgrade your vehicle or boats power system with this versatile switch key. Say goodbye to battery issues and enjoy worry free journeys on land or water. Specifications: Material:Plastic Size:Approx.47x43mm/1.85x1.69inch Color:Red Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 4pcs Battery Isolator Switch