We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Two small black metal boxes with HDMI and RJ45 ports and a power adapter

STARTECH

STARTECH ST121HD20V HDMI over CAT6 v extender 4K 60 Hz 165 ft

SKU CH-GYVS-JWHW0 MPN ST121HD20V

Transmits 4K 60 Hz HDMI with HDR up to 165 ft over a single CAT6 cable and includes IR pass-through

  • Distance165 ft.
  • Resolution SupportMaximum Digital Resolutions: 3840 x 2160 (4K) @ 60 Hz Suppor
  • Audio7.1 Surround Sound
  • HDMIConnector A: 1 x HDMI (19-pin) Female Connector B: 1 x HDMI
  • Network InterfaceConnector A: 1 x RJ-45 Female Connector B: 1 x RJ-45 Female
  • Power SupplyCenter Tip Polarity: Positive Input Current: 0.3A Input Volt
  • Transmit 4K 60 Hz video up to 165 ft over a single CAT6 cable
  • HDR and 4:4:4 chroma deliver vivid colour and full detail at distance
  • HDCP 2.2 compliance protects premium 4K content across the link
  • IR blaster and receiver included for remote source control from the display side
  • Universal power adapter with multiple plug types powers the kit worldwide

4K 60 Hz HDMI Extender

This StarTech.com extender kit transmits HDMI signals up to 165 ft over a single CAT6 cable. It supports 4K resolution at 60 Hz with HDR and 4:4:4 chroma subsampling. The set includes transmitter and receiver units, IR accessories, and a universal power adapter. It is designed for professional A/V installations requiring extended reach.

Installers needing 165 ft 4K links

The kit suits integrators running 4K 60 Hz sources to distant displays over existing CAT6 infrastructure. HDCP 2.2 compliance ensures compatibility with protected content streams. It is not for runs exceeding 165 ft or installations requiring fibre transmission. Buyers needing multi-point distribution or HDBaseT protocol support should look elsewhere.

Handles 4K 60 Hz at full distance

The extender comfortably delivers 3840 x 2160 at 60 Hz across the full 165 ft span with HDR metadata intact. Lower resolutions such as 1080p and 720p also run at 60 Hz without degradation. It runs out beyond the 165 ft maximum cable length or when CAT6 cabling does not meet specification. IR control and 7.1 surround audio pass through within the same range.

Highlights

  • Transmit 4K 60 Hz video up to 165 ft over a single CAT6 cable
  • HDR and 4:4:4 chroma deliver vivid colour and full detail at distance
  • HDCP 2.2 compliance protects premium 4K content across the link
  • IR blaster and receiver included for remote source control from the display side
  • Universal power adapter with multiple plug types powers the kit worldwide

Specifications

BrandStarTech.com
ModelST121HD20V
Distance165 ft.
Resolution SupportMaximum Digital Resolutions: 3840 x 2160 (4K) @ 60 Hz
Supported Resolutions:
3840 x 2160 (4K) 60 Hz
2560 x 1600 60 Hz
1920 x 1200 60 Hz
1920 x 1080 (1080p) 60 Hz
1280 x 720 (720p) 60 Hz
* Lower resolutions and refresh rates, not stated but below the maximum, may also be supported
Audio7.1 Surround Sound
HDMIConnector A: 1 x HDMI (19-pin) Female
Connector B: 1 x HDMI (19-pin) Female
Network InterfaceConnector A: 1 x RJ-45 Female
Connector B: 1 x RJ-45 Female
Power SupplyCenter Tip Polarity: Positive
Input Current: 0.3A
Input Voltage: 110-240V AC
Output Current: 1A
Output Voltage: 12 DC
Plug Type: M
Power Source: AC Adapter Included
SpecificationHardware
Audio: Yes
AV Input: HDMI
AV Output: HDMI
Cabling: Cat 6 UTP
Performance
Maximum Cable Length: 165 ft.
Wide Screen Supported: Yes
Environmental
Humidity: 0% - 80% RH (non-condensing)
Operating Temperature: 0 to 40 celsius degree
Storage Temperature: -20 to 60 celsius degree
Physical Characteristics
Color: Black
FeatureThis HDMI over CAT6 extender lets you transmit your 4K 60 Hz signal up to 165 ft. (50m) over a single CAT6 cable. The extender supports High Dynamic Range (HDR), providing high contrast images with enhanced video.
Astonishing 4K Picture Quality
This HDMI Ethernet extender supports a 4K 60 Hz (3840 x 2160) resolution, providing four times the picture quality of high-definition (1080p). The extender supports HDMI 2.0 capabilities, offering 4:4:4 chroma subsampling. This ensures a crystal-clear picture that's ideal for delivering video content. With HDR support, you can enjoy increased
Package Content1 x HDMI over CAT6 Transmitter
1 x HDMI over CAT6 Receiver
1 x IR Blaster
1 x IR Receiver
1 x Universal Power Adapter (NA/JP, EU, UK, ANZ)
1 x Quick-Start Guide
Shipping weight1.36 kg
Package size254 × 203 × 152 mm

Questions about this item

What HDMI source and display do I need to use the ST121HD20V extender kit?

You need an HDMI source such as a media player or PC and an HDMI display such as a 4K TV or monitor, both with standard 19-pin HDMI ports, plus a single CAT6 UTP cable up to 165 ft between the transmitter and receiver.

Will the extender pass 4K 60 Hz HDR from a newer source to an older 1080p display that only supports HDCP 1.4?

The kit is HDCP 2.2 compliant and backwards compatible with earlier HDMI and HDCP versions, so it will transmit the signal, but the older display will only show its native 1080p 60 Hz resolution.

How can I verify the link is delivering 4K 60 Hz 4:4:4 after I connect everything?

Check the display’s on-screen information menu — it should report 3840 x 2160 at 60 Hz with 4:4:4 chroma, and HDR content should show noticeably higher contrast and colour depth.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.