My camper has an outlet that says for 12 volt television only. It looks like a 12 volt outlet (cigarette lighter style). It has an on off button to turn the power to the outlet on. Is there anything special about this or could I plug in a usb phone charger to it? Seems like 12 volt outlet is a 12 volt outlet as long as I don't try to hook a 2000 watt inverter to it. Just thinking it would be nice when we don't have shore power and I haven't installed anything else to charge the phones and hook into the battery. Interestingly, my camper came with a tv but it's 120 not 12 volt. TV has been sitting in a closet since we got it!!!