Product Announcement from SFCable.com
The MHL adapter connects to the Micro USB input on the base of the Samsung Galaxy S3* to create a full size HDMI port. Connect it to a HDTV or monitor using an HDMI cable (not included) and view full screen video and photos from your phone!
The MHL adapter has a micro USB port to accept power from a separate source such as the standard Galaxy S3 battery charger (supplied with S3). This means that with the MHL adapter you can watch a video stored on the Galaxy S3 on your HDTV and keep the phone charged simultaneously.
*WILL WORK WITH SAMSUNG GALAXY S3 ONLY - NOT BACKWARDS COMPATIBLE WITH THE S2/NOTE/NEXUS