What Is the HDS-EXM400-K?
The OREI HDS-EXM400-K is a 4K@30Hz HDMI over IP extender with IR control that extends one HDMI source to a remote HDMI display up to 400ft / 120m over CAT6 / CAT7 cable. It can also support one-to-many distribution by connecting multiple Receivers to one Transmitter through a network switch.
The kit includes one Transmitter, one Receiver, one IR Blaster cable, one IR Receiver cable, two power adapters, and a user manual. The HDMI source connects to HDMI INPUT on the Transmitter, the remote display connects to HDMI OUTPUT on the Receiver, and CAT6 / CAT7 cable connects the Transmitter and Receiver directly or through a network switch for multi-receiver setups.
The HDS-EXM400-K supports HDMI 1.4 and HDCP 1.4, with a video bandwidth of 10.2Gbps. It supports video resolutions up to 4K@30Hz, 1080p, 720p, 576p, 480p, and 1080i. It also supports 3D video, uncompressed LPCM audio, one-way IR control from the Receiver side to the Transmitter side, and HDMI over IP functionality.
The HDS-EXM400-K is useful for home theaters, classrooms, conference rooms, retail displays, restaurants, bars, digital signage, security monitoring, commercial AV setups, and installations where one HDMI source needs to be extended or distributed to multiple displays over a network switch.
IMPORTANT — HDS-EXM400-K Is an HDMI over IP Extender
The HDS-EXM400-K extends HDMI over CAT6 / CAT7 cable using HDMI over IP functionality.
| Function | Support |
| 1 HDMI input | Supported |
| 1 HDMI output per Receiver | Supported |
| Point-to-point extension | Supported |
| One-to-many extension through network switch | Supported |
| One-way IR control | Supported |
| HDMI loop out | Not listed |
| Matrix switching | Not supported |
| Extended desktop creation | Not supported |
This model can be used as a basic one-to-one HDMI extender or as a one-to-many HDMI over IP distribution system using additional Receivers and a compatible network switch.
IMPORTANT — Supports 4K@30Hz
The HDS-EXM400-K supports video resolutions up to 4K@30Hz.
| Feature | Support |
| 4K@30Hz | Supported |
| 1080p | Supported |
| 720p | Supported |
| HDMI 1.4 | Supported |
| HDCP 1.4 | Supported |
| Video bandwidth | 10.2Gbps |
| 3D video | Supported |
| HDR | Not supported |
This model does not support 4K@60Hz, 4K@120Hz, 8K, HDR, HDR10, or Dolby Vision.
IMPORTANT — Extends up to 400ft / 120m Over CAT6 / CAT7
The HDS-EXM400-K extends HDMI up to 400ft / 120m over CAT6 / CAT7 cable at 4K@30Hz.
| Cable Type | Maximum Distance |
| CAT6 / CAT7 | Up to 400ft / 120m |
For best performance, use high-quality CAT6 / CAT7 cable.
Poor CAT cable, weak terminations, damaged connectors, couplers, wall plates, patch panels, or low-quality cable may cause no video, flickering, link issues, signal loss, or unstable 4K@30Hz performance.
IMPORTANT — One-to-One and One-to-Many Setups Are Supported
The HDS-EXM400-K supports both direct extension and HDMI over IP distribution.
| Setup Type | Support |
| One Transmitter to one Receiver | Supported |
| One Transmitter to multiple Receivers through network switch | Supported |
| Multiple Receivers | Supported with additional Receivers |
| Standard point-to-point extender use | Supported |
For one-to-many setups, connect the Transmitter and multiple Receivers through a network switch.
Additional Receivers can be purchased separately from Amazon or the OREI website.
IMPORTANT — Network Switch Use Is Supported for One-to-Many Distribution
Unlike direct HDBaseT extenders, the HDS-EXM400-K supports Over IP functionality.
| Connection Type | Support |
| Direct Transmitter-to-Receiver CAT connection | Supported |
| Network switch between Transmitter and multiple Receivers | Supported |
| One source to multiple displays | Supported with additional Receivers |
| Internet routing / remote cloud access | Not listed |
Use a network switch when connecting multiple Receivers to one Transmitter.
This product is intended for local HDMI over IP distribution, not internet-based streaming.
IMPORTANT — One-Way IR Control Is Supported
The HDS-EXM400-K supports one-way IR control from the Receiver side to the Transmitter side.
| IR Cable | Connection | Placement |
| IR Blaster | Transmitter IR OUT | Near HDMI source device |
| IR Receiver | Receiver IR IN | Near remote display |
This allows the HDMI source device to be controlled from the Receiver / display side.
Use the source device remote, not the TV remote, when controlling the HDMI source from the Receiver location.
IMPORTANT — Both Units Need Power
The HDS-EXM400-K includes two DC 5V/1A power adapters.
| Unit | Power Requirement |
| Transmitter | DC 5V/1A |
| Receiver | DC 5V/1A |
Both the Transmitter and Receiver must be powered for the extender to work.
This model does not list Power over Cable.
IMPORTANT — HDMI Loop Out Is Not Listed
The HDS-EXM400-K manual lists HDMI input on the Transmitter and HDMI output on the Receiver.
It does not list HDMI loop output on the Transmitter.
| Unit | HDMI Port |
| Transmitter | HDMI INPUT |
| Receiver | HDMI OUTPUT |
If a local display is needed near the source, use an HDMI splitter before the Transmitter or choose a different extender model with HDMI loop output.
IMPORTANT — Audio Pass-Through Is Supported
The HDS-EXM400-K supports uncompressed LPCM audio.
| Audio Format | Support |
| LPCM | Supported |
| Dolby Atmos | Not listed |
| Dolby TrueHD | Not listed |
| DTS-HD Master Audio | Not listed |
The connected HDMI source, display, AVR, soundbar, or audio system must also support the selected audio format.
Ports and Panel Layout
| Port / Button / Indicator | Unit | Function |
| INPUT | Transmitter | Connect HDMI source device such as DVD player, set-top box, media player, or computer |
| IR OUT | Transmitter | Connect included IR Blaster cable |
| RESET | Transmitter | Press to reset the unit |
| Power LED | Transmitter | Lights when the unit is powered on |
| DC 5V | Transmitter | Connect included power adapter |
| HDMI Signal Status LED | Transmitter | Lights when HDMI signal is passing normally |
| Link LED | Transmitter | Shows CAT cable / video link status |
| CAT6 | Transmitter | Connect CAT6 / CAT7 cable to Receiver or network switch |
| OUTPUT | Receiver | Connect HDMI display such as TV or monitor |
| IR IN | Receiver | Connect included IR Receiver cable |
| RESET | Receiver | Press to reset the unit |
| Power LED | Receiver | Lights when the unit is powered on |
| DC 5V | Receiver | Connect included power adapter |
| HDMI Signal Status LED | Receiver | Lights when HDMI signal is passing normally |
| Link LED | Receiver | Shows CAT cable / video link status |
| CAT6 | Receiver | Connect CAT6 / CAT7 cable from Transmitter or network switch |
Step-by-Step Setup
- Connect the HDMI source device to INPUT on the Transmitter.
Examples include a DVD player, Blu-ray player, cable box, satellite receiver, streaming device, media player, laptop, desktop PC, DVR, NVR, or HDMI matrix output.
- Connect CAT6 / CAT7 cable from the Transmitter CAT6 port to the Receiver CAT6 port for a one-to-one setup.
- For a one-to-many setup, connect the Transmitter CAT6 port to a network switch.
- Connect each Receiver to the same network switch using CAT6 / CAT7 cable.
- Connect HDMI OUTPUT on the Receiver to a TV, monitor, projector, or display.
- Connect the included DC 5V/1A power adapter to the Transmitter.
- Connect the included DC 5V/1A power adapter to the Receiver.
- If using IR control, connect the IR Blaster cable to IR OUT on the Transmitter.
- Place the IR Blaster near the HDMI source device’s IR sensor.
- Connect the IR Receiver cable to IR IN on the Receiver.
- Place the IR Receiver near the remote display where the remote will be used.
- Power on the HDMI source, display, Transmitter, Receiver, and network switch if used.
- Check that the power LEDs are on.
- Check the Link LED and HDMI Signal Status LED.
- Test video, audio, and IR source control.
CAT Cable Requirement — Critical
Use high-quality CAT6 / CAT7 cable.
| Requirement | Specification |
| Cable type | CAT6 / CAT7 |
| Maximum distance | Up to 400ft / 120m |
| Point-to-point connection | Supported |
| Network switch connection | Supported for one-to-many setups |
Poor or incorrectly terminated CAT cable may cause:
- No video
- Flickering
- Black screen
- Link LED issues
- HDMI Signal Status LED issues
- Receiver not connecting
- One-to-many setup not working
- IR control issues
- Signal loss
- Unstable 4K@30Hz performance
Use direct, properly terminated cable whenever possible.
HDMI Cable Requirement — Critical
Use high-quality HDMI cables.
Poor HDMI cables may cause:
- No picture
- Flickering
- Black screen
- HDMI source not detected
- Receiver HDMI OUTPUT not working
- HDCP handshake issues
- Audio dropouts
For troubleshooting, test the HDMI source directly with the display before using the extender.
Network Switch Requirement — Critical
For one-to-many distribution, use a network switch between the Transmitter and Receivers.
| Setup | Requirement |
| One-to-one | Direct CAT6 / CAT7 cable between Transmitter and Receiver |
| One-to-many | Network switch with Transmitter and multiple Receivers connected |
| Additional Receivers | Required for each additional display |
If one-to-many distribution does not work:
- Confirm the Transmitter and Receivers are connected to the same switch
- Check all CAT cables
- Check power adapters for all units
- Check the Link LEDs
- Test one Transmitter and one Receiver directly first
- Replace the switch or cable if needed
IR Cable Requirement — Critical
Use the included IR cables for source control.
| IR Cable | Connects To | Purpose |
| IR Blaster cable | Transmitter IR OUT | Sends IR signal to the HDMI source |
| IR Receiver cable | Receiver IR IN | Receives remote control signal at display side |
If IR control does not work:
- Confirm the IR Blaster is connected to IR OUT on the Transmitter
- Confirm the IR Receiver is connected to IR IN on the Receiver
- Place the IR Blaster near the source device’s IR sensor
- Use the HDMI source device remote
- Make sure the CAT / network connection is working properly
Power Requirement — Critical
The HDS-EXM400-K uses two DC 5V/1A power adapters.
| Unit | Power |
| Transmitter | DC 5V/1A |
| Receiver | DC 5V/1A |
| Power Detail | Value |
| Power adapter input | AC 100–240V, 50/60Hz |
| Power adapter output | DC 5V/1A |
| Transmitter power consumption | 2W |
| Receiver power consumption | 2W |
Both units require external power. This model does not use Power over Cable.
Understanding the Transmitter
The Transmitter is installed near the HDMI source.
It has:
- HDMI INPUT
- IR OUT
- RESET button
- Power LED
- DC 5V power input
- HDMI Signal Status LED
- Link LED
- CAT6 port
The Transmitter receives the HDMI signal from the source, converts it for CAT6 / CAT7 transmission, and sends the signal to the Receiver directly or to multiple Receivers through a network switch.
Understanding the Receiver
The Receiver is installed near the remote display.
It has:
- HDMI OUTPUT
- IR IN
- RESET button
- Power LED
- DC 5V power input
- HDMI Signal Status LED
- Link LED
- CAT6 port
The Receiver receives the signal from the Transmitter through CAT6 / CAT7 cable or through a network switch, then outputs HDMI to the connected display.
Understanding the Application Example
The application diagram shows two setup options.
In a one-to-one setup, a DVD source connects to the Transmitter using HDMI. CAT6 / CAT7 cable connects the Transmitter directly to the Receiver. The Receiver connects to an HDTV using HDMI. The IR Blaster connects at the Transmitter side, and the IR Receiver connects at the Receiver side.
In a one-to-many setup, the Transmitter connects to a network switch using CAT6 / CAT7 cable. Multiple Receivers connect to the same switch, and each Receiver connects to a display. This allows one HDMI source to be distributed to multiple displays using additional Receivers.
Understanding LED Indicators
| Indicator | Status | Meaning |
| Power LED | On | Unit is powered on |
| HDMI Signal Status LED | On | HDMI signal is passing normally |
| Link LED | On | CAT cable is connected |
| Link LED | Off | CAT cable is not connected |
| Link LED | Flashing | CAT cable is connected and video output is normal |
Use these LEDs first when troubleshooting power, HDMI signal, CAT cable, or one-to-many connection issues.
Supported Video and Audio
The HDS-EXM400-K supports video formats including:
| Supported Video |
| 1080i |
| 480p |
| 576p |
| 720p |
| 1080p |
| 4K@30Hz |
| YCbCr 4:4:4 |
| YCbCr 4:2:2 |
| RGB |
| 12-bit color |
| 3D video |
Supported audio formats include:
| Supported Audio |
| LPCM |
Unsupported video features listed by the manual troubleshooting section include:
| Unsupported Feature |
| HDR |
| Dolby Vision |
Supported Technical Specifications
| Specification | Support |
| Product Type | 4K@30Hz HDMI over IP extender with IR over CAT6 / CAT7 |
| HDMI Version | HDMI 1.4 |
| HDCP Version | HDCP 1.4 |
| Video Bandwidth | 10.2Gbps |
| Maximum Resolution | 4K@30Hz |
| Transmission Distance | Up to 400ft / 120m over CAT6 / CAT7 |
| Over IP | Supported |
| One-to-Many Through Network Switch | Supported |
| 3D Video | Supported |
| HDR | Not supported |
| Color Space | YCbCr 4:4:4 / YCbCr 4:2:2 / RGB |
| Color Depth | 12-bit |
| Audio Format | Uncompressed LPCM |
| IR Control | One-way IR from Receiver to Transmitter |
| Transmitter Input | 1 x HDMI |
| Transmitter Control | 1 x IR OUT |
| Transmitter Power | DC 5V |
| Receiver Input | 1 x CAT RJ45 |
| Receiver Output | 1 x HDMI |
| Receiver Control | 1 x IR IN |
| Receiver Power | DC 5V |
| Power Supply | Input: AC 100–240V 50/60Hz; Output: DC 5V/1A |
| Power Consumption | Transmitter: 2W; Receiver: 2W |
| Housing | Metal |
| Color | Black |
| Dimensions | 120mm x 94mm x 24mm / 4.72in x 3.7in x 0.94in |
| Weight | Transmitter and Receiver: 214g / 7.55oz each |
| Operating Temperature | 0°C to 50°C / 32°F to 122°F |
| Storage Temperature | -20°C to 60°C / -4°F to 140°F |
| Relative Humidity | 5–90% RH, non-condensing |
| ESD Protection | ±4kV contact discharge, ±8kV air discharge |
What Source Devices Is the HDS-EXM400-K Compatible With?
The HDS-EXM400-K is compatible with HDMI source devices such as:
- DVD players
- Blu-ray players
- Cable boxes
- Satellite receivers
- Streaming devices
- Media players
- Desktop PCs
- Laptops with HDMI output
- DVRs
- NVRs
- Game consoles
- HDMI matrix outputs
- HDMI switch outputs
- AV receivers with HDMI output
The source must output a supported HDMI resolution up to 4K@30Hz.
What Displays Is the HDS-EXM400-K Compatible With?
The HDS-EXM400-K can connect to HDMI displays such as:
- 4K TVs
- 1080p TVs
- Monitors
- Projectors
- Commercial displays
- Classroom displays
- Conference room displays
- Retail displays
- Digital signage displays
- Security monitoring displays
- Remote display locations
For 4K@30Hz, the display must support 4K@30Hz input.
What Network Equipment Is the HDS-EXM400-K Compatible With?
For one-to-many setups, the HDS-EXM400-K can connect through a network switch.
Compatible setup examples include:
- One Transmitter to one Receiver directly
- One Transmitter to multiple Receivers through a network switch
- HDMI distribution to multiple displays using additional Receivers
Additional Receivers are required for additional display locations.
Frequently Asked Questions
Q: What is the OREI HDS-EXM400-K used for?
A: It is used to extend one HDMI source to one remote HDMI display up to 400ft / 120m over CAT6 / CAT7 cable, or distribute one HDMI source to multiple Receivers using a network switch.
Q: Is the HDS-EXM400-K an HDMI over IP extender?
A: Yes. It supports HDMI over IP functionality and can connect multiple Receivers to a single Transmitter through a network switch.
Q: Does the HDS-EXM400-K support 4K@30Hz?
A: Yes. It supports video resolutions up to 4K@30Hz.
Q: Does it support 4K@60Hz?
A: No. It supports up to 4K@30Hz.
Q: Does it support 8K?
A: No. It does not support 8K.
Q: Does it support HDR or Dolby Vision?
A: No. The manual lists HDR as not supported and troubleshooting recommends turning off HDR and Dolby Vision.
Q: What HDMI version does it support?
A: It supports HDMI 1.4.
Q: What HDCP version does it support?
A: It supports HDCP 1.4.
Q: What video bandwidth does it support?
A: It supports 10.2Gbps video bandwidth.
Q: How far can it extend HDMI?
A: It extends HDMI up to 400ft / 120m over CAT6 / CAT7 cable.
Q: What CAT cable should I use?
A: Use CAT6 or CAT7 cable.
Q: Can I connect it through a network switch?
A: Yes. This model supports HDMI over IP functionality and can connect multiple Receivers to one Transmitter through a network switch.
Q: Can I use it as a direct point-to-point extender?
A: Yes. You can connect the Transmitter directly to one Receiver using CAT6 / CAT7 cable.
Q: Can I connect multiple displays?
A: Yes, with additional Receivers connected through a network switch.
Q: Where can I purchase additional Receivers?
A: Additional Receivers can be purchased from Amazon or the OREI website.
Q: Does it support Power over Cable?
A: Power over Cable is not listed for this model. Both the Transmitter and Receiver use their own DC 5V/1A power adapters.
Q: Do both units need power adapters?
A: Yes. The package includes two power adapters, one for the Transmitter and one for the Receiver.
Q: What power adapter does it use?
A: It uses DC 5V/1A power adapters.
Q: Does the Transmitter have HDMI loop out?
A: HDMI loop out is not listed for this model.
Q: Does it support IR control?
A: Yes. It supports one-way IR control from the Receiver side to the Transmitter side.
Q: Which IR cable connects to the Transmitter?
A: The IR Blaster cable connects to IR OUT on the Transmitter.
Q: Which IR cable connects to the Receiver?
A: The IR Receiver cable connects to IR IN on the Receiver.
Q: Can each display show different content?
A: No. In one-to-many mode, the same HDMI source is distributed to the connected Receivers.
Q: Can I use this to extend my PC display to multiple locations?
A: It can duplicate the PC screen to multiple locations with additional Receivers, but it does not create separate extended desktop screens.
Q: Does it support audio pass-through?
A: Yes. It supports uncompressed LPCM audio.
Q: Does it support Dolby Atmos?
A: Dolby Atmos is not listed in the manual.
Q: Does it support RS-232?
A: RS-232 is not listed for this model.
Q: Does it support audio extraction?
A: Audio extraction is not listed for this model.
Q: What does the Link LED mean?
A: Link LED on means the CAT cable is connected, off means the CAT cable is not connected, and flashing means the CAT cable is connected and video output is normal.
Q: What does the HDMI Signal Status LED mean?
A: It lights up when the HDMI signal is passing normally.
Q: What should I do if there is no output?
A: Try a lower resolution from the source device, try changing the CAT cables or HDMI cables, and turn off unsupported features like HDR and Dolby Vision.
Q: What should I do if one-to-many mode does not work?
A: Check the network switch, CAT cables, power adapters, Link LEDs, and test one Transmitter with one Receiver directly before adding more Receivers.
Q: What should I do if IR control does not work?
A: Confirm the IR Blaster is connected to IR OUT on the Transmitter, the IR Receiver is connected to IR IN on the Receiver, and the IR Blaster is placed near the HDMI source device’s IR sensor.
Q: Does the HDS-EXM400-K need external power?
A: Yes. Both the Transmitter and Receiver require the included DC 5V/1A power adapters.
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