Zinc alloy structure, efficient conduction: The switch is made from high-purity aluminum to ensure low resistance and minimal power loss. The metal housing effectively dissipates heat to ensure long-term stable operation. 12/24V dual voltage compatible: Suitable for 12V and 24V battery systems, ideal for cars, trucks, RVs, ships, and other vehicles. It can disconnect the negative power supply to prevent battery drain during idle periods. Negative pole cut-off function, safe and convenient: Compared to positive pole disconnection, the negative pole circuit disconnection reduces the risk of short circuits and enhances operational safety. The manual knob allows tool-free switching. Compact PCB design, saving installation space: The small size fits easily into tight spaces such as battery compartments or trunks. Standard terminals support series and parallel wiring for flexible installation options. Professional battery management, extending battery life: Effectively cuts off parasitic power consumption from standby electronic devices like clocks and alarms, minimizing battery discharge—ideal for vehicles in long-term storage. Product Contents: 1 x Car Battery Disconnect Switch