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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

  • Supported distance165 ft (50.3 m)
  • Supported resolutionsMaximum Digital Resolutions: 3840 × 2160 (4K) @ 60 Hz Suppor
  • Sound7.1 Surround Sound
  • HDMI portsConnector A: 1 x HDMI (19-pin) Female Connector B: 1 x HDMI
  • Connection typeConnector 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.

How it compares

Measured against everything we stock in A/V Extenders & USB Hubs, at today’s prices. Recalculated every night.

Price $110.99
Cheaper than about 59% of the 239 comparable items (median $132.99).

Specifications

Product
Brand nameStarTech.com
Model nameST121HD20 V
Performance
Supported distance165 ft (50.3 m)
Audio & video
Sound7.1 Surround Sound
Connectivity
Connection typeConnector A: 1 x RJ-45 Female
Connector B: 1 x RJ-45 Female
Ports & slots
HDMI portsConnector A: 1 x HDMI (19-pin) Female
Connector B: 1 x HDMI (19-pin) Female
Size & build
Shipping weight1.36 kg
Package size254 × 203 × 152 mm
In the box
Included items1 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

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.

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