Features: This battery isolators are small and suitable for almost anywhere, for ATV, UTV, Boats, RV's,marine vehicle, truck, caravan. The Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same for time. When the engine is started and the start battery reaches 13.3 volts, the VSR engages, allowing two battery banks (start and house) to be charged simultaneously. When the voltage drops below 12.8 volts (eg the engine is stopped), the VSR disengages, separating the batteries. This system eliminates the possibility of draining the start battery and protects sensitive electronic equipment powered from the house battery from harmful engine start up spikes. Advantages of fitting a VSR over conventional charge (diode isolators). Easy 3 wire connection at the battery. No need to bypass existing alternator wiring. VSR have no volt drop. Conventional diode isolators incur a minimum of 0.6 volt drop. Compact size - No large heat sink Cost effective solutionQuality products; affordable prices. Package Includes: 1x Dual Battery Isolator Specifications: Material:ABS Size:Approx.68x52x68mm/2.68x2.05x2.68in Continuous current: 80-100A Instantaneous current: 125A Current consumption - charging: 240mA Current Consumption - Standby: 8mA Breakaway Delay: 5-10 seconds Recommended fuse: 80Amp Power stud: M6 copper screw nut Surge Protection: Built-in Net Weight:50g note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.