- MHL (Mobile High-Definition Link) is a standard developed by mobile device manufacturers that provides a mobile audio/video connection allowing users to connect mobile phones, tablets and other portable devices to HDTVs and audio receivers. Smartphones and tablets with MHL can instantly connect to larger HD TVs and display streaming video, pictures and games complete with surround sound. If you have an MHL TV, MHL will be easy to connect your MHL-enabled phone or tablet. It can also connect to other devices such as a monitor or projector to mirror everything on your phone to the larger screen display. Also available is a MHL to HDMI adapter.