12V, 140A, 133V cut-in voltage, 128V cut-out voltage; Include All the Bits and Pieces Needed for a Complete InstallationWorking Voltage: Having Voltage Sensitive Chip,Rely Cuts in at 133 Volts and Cuts out at 128 Volts to Ensuring Primary Battery is Always for Vehicle to Run.Fuction:Like Having Two Separate Sources,The Dual Battery Isolator Kit Enables Your Accessories to Run From a Separate Battery While the engine is not running on your vehicle While keeping your Main Battery Charged and Your Vehicle Always to Go and Start When You Want It.Compatibility: This battery isolators are small and suitable for almost anywhere, for ATV, UTV, Boats, RV's,marine vehicle, truck, caravancolour: blackMaterial: ABSPackage Contents:1 x Dual Battery IsolatorOnly 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.