Separate your secondary audio battery from your vehicle's power system with this 200-Amp Battery Relay and Isolator by Stinger. High-current relays integrate reliably and efficiently into your audio system to prevent primary battery discharge. The SGP32 features a water-resistant design making it ideal for marine, powersports, and off-road applications. This Stinger 200-amp relay and isolator also features black phenolic plastic for protection against moisture and is compatible with most types of alternators for convenience.