The Vevor dual battery isolator kit is designed for 12V dual-battery systems in compact vehicles such as UTVs, ATVs, jet skis, and snowmobiles. It uses smart voltage-sensitive relay technology to help prevent cross-feeding and battery depletion while keeping the main battery ready to start. The kit includes a dual voltage voltmeter for real-time monitoring of the main and auxiliary batteries. Its plastic housing is built to resist water, dust, shock, vibration, and cold conditions. With included cables and accessories, it is made for quick installation without modifying the original vehicle wiring.