Handles 200 Amps Continuous And 300 Amp Surges. Durable Weatherproof Construction. A Must For Multi Battery Sytems. Allows For Longer Battery Life And Control Over Which Battery Is Being Used. Great For Isolating Second Battery In Boats Making It Dedicated Only To The Stereo System. Keeps Primary Starting From Being Drained. Unlike Dual Battery Isolators, The IB200 Does Not Create Any Voltage Drop To The Secondary Battery.