Features: Dual battery isolation protection controller, which automatically detects and identifies the system voltage after the isolator is powered on. High current 150 Amp, Universal application 12V/24V, LCD display voltage of two batteries. This compact battery isolator was built small (127mmX147mmX43mm) to fit almost anywhere! VOLTAGE SENSITIVE RELAY: The Automatic 150 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay (VSR) cuts in at 13.5 volts (27V) and cuts out at 16 volts (32V) to your primary battery is always and ready to start your vehicle. It's like having two separate power sources for each battery while only having one alternator! Battery Isolator fits for a wide variety of vehicles - Suitable for 12V/24V , Trucks, ATVs, UTVs, Boats, RVs, , Off-road Vehicle, Caravan & Camping Applications. Don't need to drain the original battery on your vehicles trying out your new devices when off-roading, the dual battery isolator will be a nice solution. This ensures your primary battery is always and that you don't get caught stranded ever again. With this dual battery isolator, no worries of engine cannot be started when original battery out of power, just pressing the emergency button to turn on the auxiliary battery to start the engine. Easy-to-Install for the most novice . Specifications: Input Voltage: 12V/24V working voltage and load voltage Continuous Current: 150A normally open Current: 150A normally open Automatic Connection Voltage: 13.5V-16V (12V) / 27V-32V (24V) Automatic Disconnection Voltage: 12.5V, immediately disconnect if below 12.5V Over Voltage: 16V/32V Size: 127mmX147mmX43mm /5.8 x 5 x 1.7inch Colour: Black material: metal Package Contents: 1 x 150A Dual Battery Isolator 1 x User's Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.