StarTech.com HDMI Over CAT6 Extender - Power Over Cable - Up to 100 m (328 ft.)

Manufacturer: Startech | Model: ST121HDBT20L | Product ID: 5858 | Warranty: 2 Years
£417.17 (inc. VAT)
3 in stock
100% Money Back Guarantee - Risk Free

Product Technical Specification

Features
TypeAV transmitter & receiver
Maximum resolution4096 x 2160
Cable types supportedCat5e,Cat6
Maximum transfer distance100
Audio output channels7.1
LED indicatorsStatus
Supported video modes720p,1080p
Supported graphics resolutions1280 x 720 (HD 720),1920 x 1080 (HD 1080),1920 x 1200 (WUXGA),2560 x 1600 (WQXGA),3840 x 2160
MaterialAluminium
Daisy chainNo
Rubber feetYes
Product colourBlack
Ports & interfaces
Connectivity technologyWired
RJ-45 input ports1
RJ-45 output ports1
HDMI in1
Number of HDMI outputs1
Remote (IR) input2
Remote (IR) output2
Power
AC input voltage100 - 240
Operating voltage18
Input current0.6
Output current1
External power adapterYes
Power plug typeType M
Operational conditions
Operating temperature (T-T)0 - 40
Storage temperature (T-T)-10 - 60
Operating relative humidity (H-H)0 - 80
Packaging data
Package width206
Package depth280
Package height62
Package weight230
Packaging content
AC adapter includedYes
Included power plug typesANZ,EU,JP,NA,UK
Quick start guideYes
IR blaster includedYes
IR receiver includedYes
Mounting brackets includedYes
Technical details
Sustainability certificatesCE,RoHS
Logistics data
Master (outer) case width323
Master (outer) case length410
Master (outer) case height275
Products per master (outer) case6

Delivery Options

Economy Delivery
FREE
Economy Delivery

Economy Delivery (UK)

Estimated delivery date: Wed 26th Aug 2026 to Sat 29th Aug 2026
Business Express
£6.95
Business Express

Business Express

Estimated delivery date: Tue 25th Aug 2026 to Thu 27th Aug 2026
View all Delivery Options & International Rates
Extend HDMI over CAT5e/CAT6 cabling to a remote location, with support for 4K 60Hz at 70 m (230 ft.) and 1080p 60Hz at 100 m (328 ft.)This HDMI Over CAT6 extender transmits your HDMI audio/video signal to a remote location up to 100 m (328 ft.) away.Get 4K at 60Hz from 70 m (230 ft.) awayThis HDMI over CAT6 extender maintains your Ultra HD 4K picture quality, even at 70 m (230 ft.) away from your video source. If you're not running 4K video, this extender supports High-Definition 1080p 60Hz and lower resolutions at even greater distances, up to 100 m (328 ft.) from your HDMI source.With full support for your HDMI 2.0 equipment, including 4K resolution at 60Hz, this extender can transmit at a bandwidth of up to 18Gbps, making it the ideal solution for high-resolution tasks requiring the highest color detail. For smoother video and color transitions, the extender offers 4:4:4 chroma subsampling via visually lossless compression, meaning every pixel gets its own unique color.Simplify your setupThe HDMI Extender Over CAT6 offers a hassle-free solution for your digital signage project. The extender only requires a single CAT5e or CAT6 cable, so you extend an HDMI signal using existing infrastructure that’s already in your building. Plus, this HDMI extender supports Power Over Cable (POC), which means you’ll only need one power adapter connected to either your transmitter or receiver. Mounting hardware is also included for discreet, professional installation.The ST121HDBT20L is TAA compliant and backed by a 2-year StarTech.com warranty with free lifetime technical support.The StarTech.com Advantage
Features
TypeAV transmitter & receiver
Maximum resolution4096 x 2160
Cable types supportedCat5e,Cat6
Maximum transfer distance100
Audio output channels7.1
LED indicatorsStatus
Supported video modes720p,1080p
Supported graphics resolutions1280 x 720 (HD 720),1920 x 1080 (HD 1080),1920 x 1200 (WUXGA),2560 x 1600 (WQXGA),3840 x 2160
MaterialAluminium
Daisy chainNo
Rubber feetYes
Product colourBlack
Ports & interfaces
Connectivity technologyWired
RJ-45 input ports1
RJ-45 output ports1
HDMI in1
Number of HDMI outputs1
Remote (IR) input2
Remote (IR) output2
Power
AC input voltage100 - 240
Operating voltage18
Input current0.6
Output current1
External power adapterYes
Power plug typeType M
Operational conditions
Operating temperature (T-T)0 - 40
Storage temperature (T-T)-10 - 60
Operating relative humidity (H-H)0 - 80
Packaging data
Package width206
Package depth280
Package height62
Package weight230
Packaging content
AC adapter includedYes
Included power plug typesANZ,EU,JP,NA,UK
Quick start guideYes
IR blaster includedYes
IR receiver includedYes
Mounting brackets includedYes
Technical details
Sustainability certificatesCE,RoHS
Logistics data
Master (outer) case width323
Master (outer) case length410
Master (outer) case height275
Products per master (outer) case6

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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 simple, hassle-free returns policy. If for whatever reason you are not happy with the item purchased, you can return it to us within 14 days of receipt for a refund. This applies to items purchased direct through Buykingston only.

Our 14 Day Returns Money Back Guarantee:
For items returned in resaleable condition, with all original packaging. If an item has been opened for inspection but shows signs of use beyond that, a deduction may apply to reflect the reduced value — see our full Terms & Conditions (Section 12) for details.

Some items are excluded from our money-back guarantee unless they have developed a fault. These include:

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

Returns FAQs

What is your returns criteria?
14 days from date of receipt, or expected date of receipt on non-tracked items.

How do I go about returning my order?
Please contact us via our contact page with your order number. We will provide you with an RMA number and return instructions, including your return deadline and whether a freepost label applies to your order.

Do I need to contact you before returning my order?
Yes, to obtain an RMA number before sending anything back.

Does my item have to include its original packaging?
Yes, to qualify for our 14 day money-back guarantee. For faulty items, we understand you may no longer have the original packaging.

Who pays for return postage?
If your item is faulty, damaged, or not as described, we cover reasonable return postage, or provide a freepost label where available. If you are returning an item for another reason (including simply changing your mind), you are responsible for return postage unless we have expressly confirmed a freepost label in your RMA email — we recommend using a tracked and insured service for items of significant value.

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

Please ensure you have read and comply in full with Sections 11–13 of our Terms & Conditions.