inputs.text: overall good - like cooling fan light let know drawing power ability swivel however son uses laptop regular socket phone periodically stop charging briefly frustrating use mp3 player trips break charge stops music nuisance manufacturer claims 175 watt continuous output165amp 12 volt alternator 1980 watts plenty power car herelaptop 135 watt power supply drawing 135 wattsthe cellphone 5 volts not drawing anywhere close 40 wattsthere 3 sockets truck give behavior doubt flaw trucks electrical systehem certainly possible