Quick Cable Battery Isolator 140 Amp. Allows for simultaneous battery charging of a multiple battery system. Isolates batteries to ensure power to start your vehicle. Reliable solid-state circuitry. Features of Quick Cable 303304 Battery Isolator 140 Amp Ideal for marine RV automotive and commercial applications Allows for simultaneous battery charging of a multiple battery system Isolates batteries to insure power to start your vehicle Reliable solid-state circuitry Sealed to protect against oil gas salt water and harsh environments Package Contents: Quick Cable 303304 Battery Isolator 140 Amp Quick Cable 303304: Battery Isolator 140 Amp