Mobile Spec MS100W 100-Watt DC to AC Power Inverter with USB Input and 12-Volt Port Power DC and USB devices in your vehicle, includes a 12-volt DC power port 100 watts of power, run and charge iPods, MP3 players, cell phones and more Blue LED power indicator and red error indicator Dual spring contacts for maximum conductivity, input voltage range: 11-15 volt Low battery shutdown voltage: 10 volt  0.3 volt, high battery shutdown voltage: 15-16 volt