inputs.text: fan noise problehem - use car power 12 volt 15 watt miniamplifier speaker systehem works fine not used usb ports yet plastic case though instead metal would not drop anything hard use outdoors although says tailgating automatically turns not run battery actually paid lot less current price would not pay 50 however affordable seen 200 watts three ac outlets two usb outlets covers keep dust main complaint whining internal fan cools even driving listening music fairly loudly hear highpitched annoying noise put passenger seat still hear another plus long plug cord lets move around way seats seat may find place noise not problehem dont mind power switch reach driving also looking kind soundproofing material make use