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 ready to go and start when you want it to. This dual battery isolator kit features 12 Volt 140 Amp Voltage Sensitive Relay Isolator and includes all the bits and pieces needed for a complete installation. Kit includes: 1 x Smart battery isolator 1 x 23.6" length of 10mm sq red battery cable with single connector; 1 x 12" length of 10mm sq black cable with 2 connectors 1 x 12" length of 10mm sq red cable with 2 connectors 2 x SC16-8 copper crimp lugs 2 x Red heat shrink 1 x Insulated blue ring terminal 4 x Self tapping screw Fully automatic priority charging for main battery. 12V 140A isolator with Cut-In:13.3V, Cut-Out:12.8V Easy 3 wire connection at the battery. Uses exisiting wiring in vehicle No voltage drop. Compact size 12" x 8.5" x 3" No heat sink area required. Water resistant. Operation temperature range: -30 to 105? (-22 to 221?)