ISOLATOR CAR BATT DISCHG CIG PLG W/DISP
This handy device plugs straight into your vehicle cigarette lighter socket, and warns you when battery power is running low. Not only that, but it disconnects power through the unit when power gets too low. This means you can run any 12V lighting, an inverter or charger etc, and not risk draining your battery so far that it causes damage. Simple plug and play operation, no tools required!