Description: 【Double Battery System Design】: Designed for double 12V battery systems, this double battery smart isolator automatically manages battery isolates and charging 【Intelligent Optimization】: Supports real time battery detection and energy allocation, automatically switching between the primary and auxiliary batteries to ensure efficient and stable charging 【Efficient Performance】: Features a low resistance design supporting up to 140A current, enabling fast and effective battery charging and replenishment, supports automatic start and intelligent switching functions to prevent excessive battery drain and extend battery life 【 Safety Protection】: Comprehensive safety protection includes reverse current blocking, overload protection, high temperature resistance, and dustproof construction for secure operation 【Widely Applicable】: Compatible with cars, RVs, yachts, , and more, easy to install with strong adaptability to various vehicle types Specification: Material: PP Size Chart: 6.7cmx6.7cmx5cm/2.64inchx2.64inchx1.97inch Package Includes: 1 Double Battery Smart Isolator Note: 1.Turn off the emergency button immediately after starting the engine,and the islator will return to normal working state. 2.Please do not put the product under the water situation.