The TL-SM3X1-HD is a 3x1 video switcher with three HDMI inputs and one HDMI output. The unit supports HDMI video resolutions up to 4K at 30, as well as multichannel audio. The TL-SM3X1-HD supports two operating modes: auto-switch mode and manual switch mode. When in autoswitch mode, the unit will automatically switch to a signal input as soon as a new source is connected. When the active source is removed, the unit will select the first source on the lowest numbered input. In manual switch mode, the TL-SM3X1-HD will switch between connected inputs when a control command is sent to the unit via IR or through a command sent by compatible table inserts, or by using buttons on the front panel of the unit.