HDMI auto switch 4x1 can route any one of the four HDMI input ports to the display device via remote control or frontpanel button. It features an automatic switching function: when a port receives a HDMI signal, it automatically switches to that input. The time polling function cycles through the four HDMI inputs with three available time settings: 10 seconds, 15 seconds, and 20 seconds. The switch supports HD 4K at 30 Hz, meeting the video switching needs of radio and television, program production, onsite interviews, outdoor experience competitions, and school courseware production. It is suitable for use in live broadcasts and various activity venues. It supports seamless switching and can be configured for manual or automatic switching using the mode button. Output resolutions can be switched among 4K@30Hz, 1080P, and 720P, with the factory default set to 4K@30Hz. The device supports 24/30/36 bit deep color. It automatically switches between HDMI input ports (among the 4 ports, preferentially selecting the port inserted last). If an HDMI signal is unplugged, it preferentially switches to HDMI In1; if HDMI In1 is not inserted, it automatically switches to port 2, and so on.