For a high-quality HDMI switch with 5 input ports and 1 output port, supporting 4K resolution, here are some features and considerations you might look for:

1. 4K Resolution Support: Ensure that the HDMI switch supports 4K Ultra HD resolution (3840x2160 pixels) at the desired refresh rate (commonly 30Hz or 60Hz). This ensures compatibility with modern 4K TVs, monitors, and other display devices.

2. Number of Ports: Look for a switch with 5 input ports and 1 output port, allowing you to connect up to 5 HDMI source devices (such as gaming consoles, Blu-ray players, streaming devices, etc.) to a single display.

3. HDMI Version Compatibility: Verify that the HDMI switch is compatible with the HDMI version used by your devices (e.g., HDMI 2.0 or later for 4K resolution at higher refresh rates).

4. Auto-Switching: Consider whether the switch supports automatic switching between input sources based on activity (e.g., when you turn on a connected device). This can provide a seamless viewing experience without the need to manually select input sources.

5. Remote Control: Look for a switch that comes with a remote control, allowing you to easily switch between input sources from the comfort of your couch or chair.

6. Compatibility with HDCP: Ensure that the switch supports HDCP (High-bandwidth Digital Content Protection), which is required for playing copy-protected content from Blu-ray discs, streaming services, and other sources.

7. Audio Formats: Check if the switch supports various audio formats, including Dolby Digital, DTS, and PCM, to ensure compatibility with your audio setup.

8. Build Quality and Durability: Consider the build quality and durability of the switch, including the materials used, the design of the casing, and the reliability of the connectors.

9. Price and Warranty: Compare prices and warranty options from different manufacturers to ensure you get a good value for your money and peace of mind with a reliable warranty.