StarTech.com HDMI over CAT6 Extender - 4K 60Hz - 330 ft. (100 m)

Manufacturer: Startech | Model: ST121HD20L | Product ID: 5146 | Warranty: 2 Years
£350.69 (inc. VAT)
6 in stock
100% Money Back Guarantee - Risk Free

Product Technical Specification

Features
TypeAV transmitter & receiver
Maximum resolution3840 x 2160
Cable types supportedCat6
Maximum transfer distance140
ChipsetNorelsys NS 5730, NS5731
Maximum refresh rate60
Audio output channels7.1
LED indicatorsLink,Power
Supported graphics resolutions1280 x 720 (HD 720),1920 x 1080 (HD 1080),1920 x 1200 (WUXGA),2560 x 1600 (WQXGA)
HDCPYes
MaterialMetal
HDCP version1.4/2.2
Product colourBlack
Ports & interfaces
Connectivity technologyWired
RJ-45 input ports1
RJ-45 output ports1
HDMI in1
Number of HDMI outputs1
Serial ports quantity2
Remote (IR) input2
Remote (IR) output2
DC-in jackYes
Power
AC input voltage110 - 240
Operating voltage5
Output current2
External power adapterYes
Power plug typeType M
Operational conditions
Operating temperature (T-T)-5 - 40
Storage temperature (T-T)-15 - 55
Operating relative humidity (H-H)0 - 95
Weight & dimensions
Width111
Depth76
Height26
Weight271
Packaging data
Package width248
Package depth185
Package height95
Package weight1424
Packaging content
AC adapter includedYes
Cables includedLAN (RJ-45)
Included power plug typesANZ,EU,JP,NA,UK
Quick start guideYes
Mounting brackets includedYes
Logistics data
Master (outer) case width520
Master (outer) case length420
Master (outer) case height280
Products per master (outer) case10

Delivery Options

Economy Delivery
FREE
Economy Delivery

Economy Delivery (UK)

Estimated delivery date: Sun 07th Dec 2025 to Wed 10th Dec 2025
Business Express
£6.95
Business Express

Business Express

Estimated delivery date: Sat 06th Dec 2025 to Mon 08th Dec 2025
View all Delivery Options & International Rates
4K HDMI Balun | Visually Lossless Compression | IR Support

This HDMI over CAT6 extender lets you transmit your HDMI signal over a CAT6 cable up to 330 ft. (100 m) away. The extender supports Ultra HD 4K with support for 3D and the accompanying digital audio.

Long-Distance Transmission

Extend your HDMI signal to up to 330 ft. (100 m) with this HDMI over Ethernet extender. Use your existing CAT6 cable infrastructure with a direct connection to the converter for an easy run through walls and ceilings, saving you on installation costs.

The extender also works to extend an infrared (IR) signal, enabling you to control your video source from the remote location.

Astonishing 4K Picture Quality

This HDMI Ethernet extender supports a 4K 60Hz (3840 x 2160) UHD resolution, providing four times the picture quality of high-definition (1080p), ensuring a crystal-clear picture that's ideal for displaying your 4K video content in office buildings, airports, retail settings and more.

Plus, because the extender supports 1080p and lower resolutions at up to 460 feet away, you can comfortably use this extender to make any video source look great.

Compatible with HDCP 2.2 Devices

Connect your HDMI devices and displays with confidence, knowing this extender is HDCP 2.2 compliant. This lets you harness the capabilities of HDMI-enabled devices such as Blu-ray players or online streaming devices in higher resolutions. It is also backward compatible with previous generations of HDMI and HDCP.

ST121HD20L is backed by 2-year StarTech.com warranty with free lifetime technical support.

The StarTech.com Advantage

- Maintains astonishing picture quality up to 330 ft. (100 m) away, with support for UltraHD 4K over non-proprietary CAT6 cabling
- Also supports HD 1080p video resolutions at distances up to 460 ft. (140 m)
- Hassle-free, professional installation with included mounting brackets
Features
TypeAV transmitter & receiver
Maximum resolution3840 x 2160
Cable types supportedCat6
Maximum transfer distance140
ChipsetNorelsys NS 5730, NS5731
Maximum refresh rate60
Audio output channels7.1
LED indicatorsLink,Power
Supported graphics resolutions1280 x 720 (HD 720),1920 x 1080 (HD 1080),1920 x 1200 (WUXGA),2560 x 1600 (WQXGA)
HDCPYes
MaterialMetal
HDCP version1.4/2.2
Product colourBlack
Ports & interfaces
Connectivity technologyWired
RJ-45 input ports1
RJ-45 output ports1
HDMI in1
Number of HDMI outputs1
Serial ports quantity2
Remote (IR) input2
Remote (IR) output2
DC-in jackYes
Power
AC input voltage110 - 240
Operating voltage5
Output current2
External power adapterYes
Power plug typeType M
Operational conditions
Operating temperature (T-T)-5 - 40
Storage temperature (T-T)-15 - 55
Operating relative humidity (H-H)0 - 95
Weight & dimensions
Width111
Depth76
Height26
Weight271
Packaging data
Package width248
Package depth185
Package height95
Package weight1424
Packaging content
AC adapter includedYes
Cables includedLAN (RJ-45)
Included power plug typesANZ,EU,JP,NA,UK
Quick start guideYes
Mounting brackets includedYes
Logistics data
Master (outer) case width520
Master (outer) case length420
Master (outer) case height280
Products per master (outer) case10

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Buykingston order despatch times:

We will despatch your order the very same day if we receive cleared payment by 12:00 pm Mon-Fri.

These delivery estimates apply when you order up to 12:00 pm Mon-Fri (excluding public holidays).

We charge a one off delivery cost as outlined below regardless of how many items you order or the weight of your order.

Estimated delivery times are provided to us by the respective delivery companies. We pass this information onto you, the customer.

Despatch times do not apply to UK public holidays.

Estimated delivery times are taken from the next available working day available for delivery. For example if an order was despatched on a working Wednesday by 3pm, the first available working day for delivery would be Thursday provided you placed your order by 3pm on the Wednesday. If the next available weekday is a UK bank holiday/public holiday then your order will be despatched on the next available working day.

Our warehouse reserves the right to upgrade the delivery method you select on your order.

Our available delivery options*

Contact us for a shipping quote.

*All delivery times are estimated unless stated.

Product Returns Note

Buykingston offers a very flexible and hassle free returns policy. If for whatever reason you are not happy with the item purchased you can return it to us within 12months for a refund (for unused and unopened items) or within 30 days on opened and used items for a refund. This applies to items purchased direct through Buykingston  only.

Our 30 Day Returns Money Back Guarantee Satisfaction Guarantee:
For items opened and used and that are returned in a resellable condition.

Our 365 Day Returns Money Back Guarantee Satisfaction Guarantee:
For items that remain sealed and unused.

Some items are excluded from our moneyback guarantee unless they have developed a fault. These include;

- Headphones
- Earphones
- Custom made and designed products such as flash memory products with custom logo’s on them. E,g USB flash drives and memory cards with your own logo

Returns FAQs

What is your returns criteria?
On opened items 30 days from date of receipt or expected date of receipt on non tracked items.
On unopened items 365 days.

How do i go about returning my order?
Please contact us via our contact page with your order number where we will present you with an RMA number and returns label.

Do i need to contact you before returning my order?
Yes, to obtain an RMA number.

Does my item have to include its original packaging?
Yes for items that fall within our 30 day money back guarantee and our 365 day returns. Of course for faulty items we realise you may no longer have the packaging.

Who deals with the warranty on a faulty item?
We will. In some circumstances we may ask you to contact the manufacturer direct for assistance.

Please ensure you have read and comply in full with Section 11 & 13 of our terms and conditions which you can read here in full.