Review on Efficient Battery Saver: Koolatron F70110 12V in Sleek Black Design by David Vargas

My SUV has a permanent plug in the back and I use it to power my 12v Koolatron (D24) cooler. But since it's always on, I'd have to turn it off if I stopped for a while to make sure my battery wasn't drained. This is where the Koolatron Battery Saver comes in. It plugs into my car's outlet and then the cool box. It continues to power my cooler until it detects my battery is starting to discharge (about 11 volts) and then cuts power to the cooler. Now I can just leave the cool box plugged in and not have to worry about my battery draining. Great product and works exactly as I described.