The charger that plugs into the wall made a ton of noise and died quickly (after only a few uses). I have had better luck with car chargers than with ones that plug into the wall, so I purchased an inverter to convert 115 VAC (wall power) into 9VDC (car-type power) and charge my phone that way. The unit I use wasn't cheap, and is big/bulky, but I'd rather do that and use USB power than constantly replace chargers.