This type of kit is suitable for caravans, Motor homes, 4x4s, Day caravans, Mobile workshops, Cars or Boats. Voltage sense systems are especially suited for modern vehicles with canbus controlled wiring as this type of kit does not need an ignition feed or any additional wiring and are very simple kit to install, all you need to do is to connect your battery to your leisure battery(s) by using the kit supplied, with very easy to understand fitting instructions and a wiring diagram. The voltage sense relay simply detects the rise in voltage from you vehicles charging system to allow you to charge your leisure battery(s) while your engine is running. When your engine is switched off, the relay isolate your leisure battery(s) from your main battery. So it does not drain your main battery and you always be to your vehicle. You be supplied with everything you need to fit this kit Dual Battery Isolator Kit Different batches The screws and terminals may be inside the back cover of the isolator. Please check them before delivery. Different colors do not affect the use. 12v 140amp Intelligent Voltage sense Split Charge Relay 3mtrs 10mm² Red PVC 70A@12V Power Cable 1mtr 10mm² Black PVC 70A@12V Earth Cable 1 Pair 8mm Post Type Battery Terminals MTA MIDI Fuse holders 60A MTA MIDI Fuses including 2 . Cable Crimps Terminals Connectors. Heat shrink to the connections. Colour:Photo Color Material: Plastic Size:3 Meters Package Contents: 1x Battery Bank Isolator kit Only the above package content, other products are not included. Note: Light reflection 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.