This is a USB AC power plug charger adapter. There are 2 USB port and it has 4 plug for different plug standard， so you can use it when you travel all over the world. It can use a range of devices， including MP3， digital camera， mobile phone， GPS， PDA， travel speaker， etc. It can link with smartphone. Main Features:- Universal all-in-one world travel plug adapter.- One piece unit with 4 international adapters， includes AU， US， UK， EU.- Easy to use， fits wall outlets in the most commonly traveled regions.- Protect your computer and personal appliances from spikes in the foreign electricity.- It is small and portable.- The charge adapter is suitable for MP3， digital camera， mobile phone， GPS， PDA， travel speaker， etc.- It can link with many mobile phone