Quick Cable Battery Isolator 90 Amp. 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. Temperature range 40F to 250FUse with multiple battery charging systems. For wet cell or gel cell batteries all batteries must be same type to prevent damage. Features of Quick Cable 303301 Battery Isolator 90 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 303301 Battery Isolator 90 Amp Quick Cable 303301: Battery Isolator 90 Amp