Perfect for our camper to charge our phones and lighters from the trailer's 12v battery when we weren't connected to shore power. A tiny green LED is lit all the time, but I haven't dry camped long enough to noticeably affect my trailer's battery. (Actually two 6 volt golf cart batteries with a combined capacity of about 240 amp hours). I've noticed that one Kindle charges faster than the other. I bought a black switch plate from Lowe's that matched in size and color. We then also connected a built in 5 amp fuse to the system.
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