Some people have this door installed in an area where there are no available outlets, which sometimes happens with the sliding door version of the High Tech door
. If that is an issue, the door can be run solely on the battery. Since it normally recharges via the plug when the power comes back on, the smart way to do this is to get the charger and two batteries. We have a kit for this and you can just pull the charged battery out and then plug in the dead battery and rotate them. The battery life is about 2 weeks, depending on usage.