... Max efficiency>92% 3.Portable 120w Car power inverte with USB(BERT-M-120W) 4.High quality 120w Car power ... OutputOver Voltage Shut DownDC15.5V/DC 30.5VOver ThermalShut Off Output AutomaticallyFusesShort CircuitEnvironmentWorking Temperature-10° c - +50° cWorking Humidity10% ... many place. Such as, laptop, camcorder, the Internet, GPS, camera, PDA, cell phone, mobile DVD, audio, battery charger, printers ...