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Pro A/V Extender & Repeater > 
Item#: N82E16815158384

StarTech HDMI Over Cat5/Cat6 Extender with IR - 100 ft (30m) Power Free ST121SHD30

  • Supports Cat5e and Cat6 Ethernet cabling
  • HD Res. up to 1080p (1920x1080)
  • No software/drivers required

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The StarTech ST121SHD30 HDMI extender is an economical and easy-to-use solution that extends an HDMI audio/video signal up to 100 feet (30 Meters) over a dual Cat5e or Cat6 cable. You can use your existing or new Ethernet infrastructure wiring, without the need of an expensive HDMI cable. It supports high-definition resolutions of up to 1920x1080p, and the accompanying multi-channel digital audio maintains A/V quality after extension. Including a transmitter and a receiver, this kit also supports infrared signal extension, and can be powered via the HDMI bus offering great placement flexibility. The extender kit is perfect for point-to-point digital signage applications that require high-quality HDMI video, or industrial environments where a display is installed in a convenient viewing area, while the system equipment is kept in a clean, secured environment.

For additional distance, HDMI cables up to 32 feet (10 meters) in length can be used on the local and remote ends.

Note: The extender does not work through Ethernet equipment, such as switches or routers.

  • newegg Superior A/V Quality Supports high resolutions of up to 1920x1080 / 1080p and the accompanying digital audio for superior video/audio quality.
  • newegg Power over Cable This kit features Power over cable, allowing both the Transmitter and Receiver to be powered from the HDMI video source. No power adapter is required, great for areas where access to outlets is limited.
  • newegg IR Extension The transmitter and receiver have an IR Channel jack each for IR extension, perfect for controlling your video source from your video destination.

Learn more about the STARTECH ST121SHD30




Extender & Repeater Type
Video Console/Extender


Maximum: 50 m/165 ft
Resolution Support
Maximum: 1080p/1920x1080


LED Indicator
1 x Input
1 x Output


Cabling: Cat 5 UTP or better
Ports: 1
Daisy-Chain: No

Local Unit Connectors
1 x HDMI (19 pin) Female
2 x RJ-45 Female

Remote Unit Connectors
2 x HDMI (19 pin) Female
2 x RJ-45 Female

Wide Screen Supported: Yes

Color: Black
Enclosure Type: Aluminum

Humidity: 0% - 80 %
Operating Temperature: 0 C to 40 C (32 F to 104 F)
Storage Temperature: -10 C to 60 C (14 F to 115 F)


Supports Cat5e and Cat6 Ethernet cabling

Power over HDMI

No software/drivers required

Supports HD resolutions up to 1080p (1920x1080)

Includes transmitter (local) and receiver (remote) units

Dimensions & Weight

3.2"(L) x 1.8"(W) x 0.9"(H)
0.5 lbs.

Package Contents

Package Content
HDMI over CAT5e/6 UTP Transmitter
HDMI over CAT5e/6 UTP Receiver
Foot Pad Set
User Manual
IR Extender Kit
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

Customer Reviews of the STARTECH ST121SHD30

Do you own this product? Write a Review

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3 out of 5 eggsIt worked fine... for a while

Pros: Works out of box as advertised. I needed something to get video from my cable box in the basement to a TV on the main floor. I already had the CAT6 cabling from the builder at both locations. This extender worked great for my setup.

Cons: Did not last very long - the receiver (TV/display side) died after just over 2 months. Tested with different HDMI cables on both ends, and also with just 1 ft. long CAT6 cables between the units, to no avail. The unit was just DEAD.

Did you find this review helpful? Yes No

  • Donovan S.
  • 7/6/2014 7:56:13 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsThey work...with my laptop only

Pros: Cheap and high quality
2 Year Warranty
Plug and Play right away
Any computer will still be able to pick up the TV info as if it were hooked up with a straight HDMI cable. Sound works too.

Cons: Be sure to check the power coming in from the source. If it is too low, the output receiver will glow dim. If it does, you need the more expensive active powered version of this unit (The 165' ST121SHD50).

Other Thoughts: We bought these with the intent of extending HDMI to several outdoor TVs because they were outside the safety range of HDMI cables with repeaters, over 50'. We were direct cabling these from the cable box. The Cable box does not deliver enough power to drive these units. You can tell because my laptop is able to display to the TVs outside without any problems. However, this means I need to buy the more expensive powered active version. It was my mistake to not consider the signal power out on the HDMI from the cable box.

Did you find this review helpful? Yes No

  • Core S.
  • 5/15/2014 11:21:38 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsWorks Great

Pros: This thing works great. I was able to setup my security camera system in the closet and I ran the 2 cat 6 cables to my 47 in hd tv to view my security cameras.

Cons: NONE. I dont see how James C. took this for something else. He did not know what he was doing at all.

Other Thoughts: This works great right out the box. Its nice to be able to view my security cameras in another room now on my tv.

2 out of 2 people found this review helpful. Did you? Yes No

  • Anonymous
  • 2/21/2014 10:07:22 PM
  • Ownership: 1 week to 1 month

5 out of 5 eggsWorks perfectly.

Pros: This delivers perfect video and audio over cables that are 100 feet long. I use it run video from a PC to a monitor in another room.

Cons: None. The other guy that gave this a poor review clearly had no idea how this product works. There's nothing wrong with it.

5 out of 5 people found this review helpful. Did you? Yes No

  • James C.
  • 2/17/2014 10:37:06 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsKnow what you are buying

Pros: It may do what it says and extend your video 100 ft.


Other Thoughts: I found this useless as I was trying to use my existing network to extend the video.

0 out of 15 people found this review helpful. Did you? Yes No

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Home > 
Electronics > 
Professional Video Devices > 
Pro A/V Extender & Repeater > 
Item#: N82E16815158384
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