Key benefits Prevents battery drain during long parking or when accessories are accidentally left on, preserving battery charge and extending battery life. Low standby power (3 mA) minimizes its own drain on the battery. High current capacity for reliable performance: rated current 240 A, peak current 500 A. Remote convenience with automatic protection logic to prevent accidental shutdown while driving; manual control always available. What it does Acts as a negative-pole battery isolator switch for 12 V systems. Automatically cuts power when battery voltage falls below the cut-off threshold (11.8 V ±0.2 V). The remote control will shut the circuit after 120 seconds at or below that threshold to save energy. When the vehicle charging voltage rises above 13.2 V, the wireless remote is disabled to prevent accidental shutdown while driving; control remains available manually. Key specifications Rated voltage: 12 V Rated current: 240 A Peak current: 500 A Cut-off threshold: 11.8 V ±0.2 V Standby power consumption: 3 mA Working temperature: 30°C to 90°C Dimensions: 8.3 cm x 6.0 cm x 3.5 cm Compatibility and installation Designed for connection to the negative battery pole to ensure stable performance. Fits negative pole diameters of 9–13 mm and 15–17 mm. Not suitable for vehicles with small pole heads—check your battery terminal size before purchasing. Turn off all power before installing. Compact dimensions fit most battery compartments but verify clearance. Package contents 1 x car battery isolator switch 2 x wireless remote controls 1 x English user manual Typical use scenarios Long-term parking or storage: disconnect the battery to prevent discharge from interior lights, alarm systems, or parasitic drains. Seasonal or recreational vehicles: RVs, boats, motorcycles, and classic cars that sit unused for extended periods benefit from preserved battery capacity. Fleet or commercial vehicles: protect batteries during extended downtime and reduce on-site battery replacements. Operation notes The remote provides easy on/off control when safe. If the battery voltage drops to 11.8 V ±0.2 V, the remote will automatically shut off after 120 seconds to protect the battery. When system voltage exceeds 13.2 V, the remote control is disabled to avoid shutting off the vehicle while charging; at that point only manual switching is available. This switch provides simple, dependable battery isolation for 12 V systems with the listed terminal sizes. Follow the included English manual and safety precautions during installation.