Estone Car Cigarette Lighter Dual USB Charger Socket Cup Holder Adapter Power Supply Comes with two USB ports to supply power for extra two USB-powered devices.Such as iPod, cell phone, MP3 player, PDA etc.Charges your devices while you're on the go, safely and rapidly Internal circuit to manage charging status and prevent from over or under-charging.Expands vehicle accessory power options A fuse is included with the product USB output power: DC5V ~ Max 5.4V/ 500mA (2USB)