Features: This top post battery disconnect switches features a built in voltmeter for real time electric monitoring, preventing battery over discharge and extending life in automotive and marine applications. Constructed from strong ABS plastic and copper, it supports 5 60V systems with up to 250A continuous current, ensuring stable power isolation and safety. Ideal for car owners, boat enthusiasts, travelers, and truck operators who need efficient battery management solution. Perfect for use in vehicles like cars, trucks, boats, and during storage or maintenance to cut off power and avoid parasitic drain. The ergonomic rotary design with LED indicators simplifies operate in confined spaces, while high conductivity contacts reduce energy loss for superior performances. Specifications: Type: Battery Disconnect switches component : plastic+metal Length: about 126mm/4.96inch Working electric : 12-48V Display electric : 5-80V rate current: 12V 300A Current: 250A, 12V, 300A, continuous for 30 minutes Accuracy: 0.1V 2 bits: on/off Working temperature: -40°C~80°C Working humidity: <90% Package Includes: Battery Disconnect switches note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.