UGREEN 55451 2×1 USB-C to HDMI Switch, 4K60
Overview
Correct direction is the first troubleshooting check. Similar-looking HDMI, DisplayPort and USB-C products can require completely different source and display sides.
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What it does well.
Key features
Inputs.
Outputs.
Video ceiling.
Power.
How switching and multi-display behavior works
Two USB-C video sources share one HDMI display. The direction is fixed and cannot be reversed. Only one monitor is supported; it cannot send one source to two USB-C screens.
Control: Manual button only; automatic switching is not supported.
Never assume: a product advertised as “bidirectional,” “splitter” or “matrix” behaves like another topology. Follow the source/output map above.
Resolution, refresh and feature boundary
Maximum listed mode.
Interface boundary.
Audio path.
Complete-path rule.
Use scenarios
Scenario 1.
Scenario 2.
Scenario 3.
Scenario 4.
Setup and usability guidance
Best first test: one source, one short cable path, one display and 1080p60. Expand only after this baseline works.
- Step 1: Verify both USB-C ports provide DisplayPort Alt Mode; a USB-C shape alone is insufficient.
- Step 2: Use fully featured USB-C cables no longer than 2m to the two inputs.
- Step 3: Connect HDMI Output to one HDCP-capable display.
- Step 4: Select the correct display input, then press the switch button for Source 1 or Source 2.
- Step 5: Start at 1080p60 and move to 4K60 after both sources are confirmed.
- Step 6: Do not connect docks, storage enclosures or chargers to the source inputs.
Compatible devices and systems
Compatible system boundary.
Cable planning.
Audio planning.
Power planning.
What this product does
- Follows this path: USB-C Source 1 or USB-C Source 2 (both must support DisplayPort Alt Mode) → button selection → one HDMI display output.
- Supports its ceiling: Up to 4K60; backward compatible with 4K30 and 1080p60.
- Uses these ports: 2 × USB-C female video inputs → 1 × HDMI Type-A female.
- Handles control this way: Manual button only; automatic switching is not supported.
- Passes compatible audio: Compatible audio is carried with HDMI video; Dolby Atmos is listed for a compatible complete path. ARC is explicitly not supported.
What this product does not do
- Fixed USB-C-source to HDMI-display direction
- No DisplayPort Alt Mode means no picture
- One display only
- No automatic switching
- ARC, CEC and FreeSync are explicitly not supported
- Do not place a Thunderbolt dock or Thunderbolt drive enclosure in the input path
What to do
Label.
Build gradually.
Verify cables.
Power safely.
Record settings.
What not to do
Do not reverse.
Do not confuse.
Do not assume scaling.
Do not force.
Do not overclaim.
Warnings and limitations
- Power: No separate power input or charger function is documented; do not connect chargers as though the source ports were PD inputs.
- Display negotiation: mixed displays can force a lower common mode or create a blank screen.
- Protected content: HDCP must be supported end to end; the device cannot bypass protection.
- Heat and moisture: indoor use only; keep dry, ventilated and away from direct heat.
- Cables: UGREEN recommends Thunderbolt 4 or fully featured USB-C cables no longer than 2m. Charge-only and USB 2.0-only USB-C cables cannot supply display video.
Troubleshooting checklist
No picture.
Picture drops.
Wrong resolution.
No audio.
Remote or hotkey fails.
Protected video blanks.
At a glance.
- Brand / SKU
- UGREEN 55451
- Product type
- a two-input, one-output video switch for selecting between two USB-C sources on one HDMI display
- Signal path
- USB-C Source 1 or USB-C Source 2 (both must support DisplayPort Alt Mode) → button selection → one HDMI display output.
- Inputs
- 2 × USB-C female video inputs
- Outputs
- 1 × HDMI Type-A female
- Power
- No separate power input or charger function is documented; do not connect chargers as though the source ports were PD inputs
- Topology
- 2 USB-C video inputs / 1 HDMI output
- Required source feature
- DisplayPort Alt Mode over USB-C
- Listed maximum
- 4K@60Hz
- Bandwidth
- 18Gbps as listed
- Listed video features
- HDR; HDCP 2.2
- Switching
- Manual button
- Explicit exclusions
- No reverse use, auto switching, ARC, CEC or FreeSync
1 × UGREEN 55451 USB-C-to-HDMI switch. The listing does not clearly identify USB-C or HDMI cables as included, so plan to supply two fully featured USB-C video cables and one HDMI cable.