around the boat. I use them for fans, radios, phones, I-pod, c-pap, inverters, computers and more. I have 3 in the Pilot House, 4 in the forward bunk area (2 fans, TV DVD player) and three in the main solon. I find them very handy. It might be handy and a little cleaner to have a couple of USB sockets but the lighter ones work just fine.