OEM AT&T rapid Car Charger Cigarette lighter adapter lets you charge your iPhone or iPod in the car and provides unlimited talk and playback time while in the car. Integrated USB port lets you charge another device like an MP3 player or another cell phone at the same time via a USB cable. Swivel cap conceals USB charging port when not in use. AT&T Car Charger w/ USB Port plugs into your car, truck or SUV's 12V cigarette lighter socket. Enhanced internal circuitry to manage charging status and prevent over- and under-charging. Integrated electrical fuse to prevent damage to phone or battery. Compatible with Apple iPhone / iPhone 3G / iPhone 3GS. lease be aware that when charging certain devices through this product's USB port, charging occurs at a steadily gradual rate. On some products, the battery indicator will not display a charge that is in progress. With certain combinations of devices, charging is sequential and not simultaneous - as the device attached to the port will charge before the USB device.