Cobra CPI 200 CH 200 Watt Power Inverter Cup Holder Design, USB Output: Input Voltage:12V DC - Allows charging and operation of modern office devices such as iPod's, Blackberry's and cell phones. Simply plug the attached cord into your vehicle's cigarette lighter or 12 Volt accessory port to convert 12 VDC battery power to 120 VAC household power. Its compact size and cup holder design make it ideal for travelers.