Stinger SGP32 Stinger 200 AMP Relay and IsolatorStinger SGP32 Stinger 200 AMP Relay and Isolator Key Features Prevents primary battery discharge Maximum current transfer Ideal for 2nd audio battery isolation from vehicle systems High current relays are the most reliable and efficient way to add secondary batteries to your system Compatible with all types of alternators and charging systems Water resistant black phenolic plastic 100,000 mechanical cycle life 200A constant 500A peak current