The 1374A is a 4-input, 1-output HDMI switcher that allows switching between multiple HDMI source devices like Blu-ray players and sending high definition video and audio to a single TV or display. It supports resolutions up to 1080p and audio formats like Dolby Digital. The switcher can be controlled via front panel buttons, remote control, or RS-232 connection. It provides reliable switching of HDMI signals due to high quality chipsets and all-metal construction.