Samsung MHL to HDMI Adapter - Data Cable - Micro USB - Retail Packaging for AT&T SGH-i77 & T-Mobile SGH-T989 Works with the AT&T SGH-i777 or the T-Mobile SGH-T989 phone Connect your MHL-enabled phone to your high definition TV or computer monitor Supports HD signals up to 1080p Creates an HDMI docking station for your mobile phone