Loss of battery power, due to frequent short-distance use, the battery has been out of charge, which will result in many problems. Therefore, we usually need a battery isolator to protect the battery and extend its service . Features - Color: Assorted color. - Material: ABS, copper. - Size: About 6.40X4.30X3.70cm/2.52X1.69X1.45in. - Battery serves as a power cut off when vehicle or boat is not in use on RV, ATV, car, marine boat, camper, travel trailer, truck, etc. - Battery selector can stand alone or be locked together with other for minimizing battery loss and preventing electric leakage effectively. - Provides the most effective way to prevent car theft, and can also turn off the power of racing car and prevent fire. - Helps to avoid battery derailment during storage and repair of car / truck. - The unique rotary design makes it more practical, can you and better serve you. Specification: Rated current: 100A. Maximum current: 300A. Product voltage: 12V, 24V. Contacts resistance: 50M. Insulation resistance 100M. Thread diameter: 6MM. Package list: 1 x power-off 4 terminals 4 x heat shrink tubes