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
Black transmitter and receiver boxes with HDMI, RJ45 and 3.5mm ports, plus IR kit and power adapters

STARTECH

STARTECH ST121HD20L HDMI over CAT6 extender 4K 60Hz 330ft 100m IR support

SKU CH-1M5M-1AV96 MPN ST121HD20L

Extends 4K 60 Hz HDMI up to 330 ft over CAT6 with IR, RS-232 and 7.1 audio, includes transmitter, receiver, cable, IR kit, power adapters and mounting brackets

  • TypeHDMI over Ethernet
  • Max Extend Distance330 feet
  • ColorBlack
  • SpecificationsAudio: Yes AV Input: HDMI AV Output: HDMI Cabling: Cat 6 UTP
  • Connector A1 x HDMI (19 pin) Female 1 x RJ-45 Female 1 x 3.5 mm Mini-Ja
  • Connector B1 x HDMI (19 pin) Female 1 x RJ-45 Female 1 x 3.5 mm Mini-Ja
  • Extends 4K 60Hz HDMI up to 330ft over CAT6 cabling
  • Delivers 7.1 surround sound with Dolby TrueHD and DTS-HD support
  • Reaches 1080p at 460ft for longer-distance installations
  • Includes IR kit and RS-232 adapters for remote control integration
  • Ships with transmitter, receiver, CAT6 cable, power adapters and mounting brackets

HDMI over CAT6 extender for 4K 60Hz signals

The ST121HD20L transmits 3840x2160 at 60 Hz up to 100 metres over Cat 6 UTP cabling. It includes transmitter and receiver units plus an IR kit for remote source control. Two universal power adapters and mounting brackets are supplied for quick installation.

330-foot 4K 60Hz reach over Cat 6

UltraHD 4K at 60 Hz is maintained to the full 330 feet distance; 1080p extends further to 460 feet. The Norelsys NS 5730 and NS 5731 chipset handles HDCP 2.2 and 7.1 surround audio pass-through without compression.

Passive cooling with external 5 V 3 A adapters

Each unit draws power from its own 110-240 V AC adapter delivering 5 V DC at 3 A. No fans are fitted so operation is silent. The compact 4.37 by 1.02 by 3 inch enclosures run cool under continuous use.

Highlights

  • Extends 4K 60Hz HDMI up to 330ft over CAT6 cabling
  • Delivers 7.1 surround sound with Dolby TrueHD and DTS-HD support
  • Reaches 1080p at 460ft for longer-distance installations
  • Includes IR kit and RS-232 adapters for remote control integration
  • Ships with transmitter, receiver, CAT6 cable, power adapters and mounting brackets

Specifications

BrandStarTech.com
ModelST121HD20L
TypeHDMI over Ethernet
Max Extend Distance330 feet
ColorBlack
SpecificationsAudio: Yes
AV Input: HDMI
AV Output: HDMI
Cabling: Cat 6 UTP
Chipset ID: Norelsys NS 5730, NS5731
Audio Specifications: 7.1 Surround Sound
Max Distance: 140 m / 460 ft
Wide Screen Supported: Yes
Supported Resolutions:
3840x2160 (4K) 60Hz
2560x1600 60Hz
1920x1200 60Hz
1920x1080 (1080p) 60Hz
1280x720 (720p) 60Hz
*Lower resolutions and refresh rates, not stated but below the maximum, may also be supported
Center Tip Polarity: Positive
Input Voltage: 110V-240V AC
Output Current: 3 A
Output Voltage: 5V DC
Plug Type: M
Power Source: 2 AC Adapters Included
Connector A1 x HDMI (19 pin) Female
1 x RJ-45 Female
1 x 3.5 mm Mini-Jack (3 Position) Female Input
1 x 3.5 mm Mini-Jack (3 Position) Female Output
1 x 3.5 mm Mini-Jack (3 Position) Female
Connector B1 x HDMI (19 pin) Female
1 x RJ-45 Female
1 x 3.5 mm Mini-Jack (3 Position) Female Input
1 x 3.5 mm Mini-Jack (3 Position) Female Output
1 x 3.5 mm Mini-Jack (3 Position) Female
FeaturesMaintains 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
Supports all known HDMI audio formats including Dolby True HD, Dolby Digital and DTS-HD
Ensured compatibility with HDCP 1.4 / 2.2
Dimensions4.37" x 1.02" x 3"
Weight0.60 lbs.
Package Contents1 x HDMI Transmitter
1 x HDMI Receiver
1 x CAT6 Cable
1 x IR Kit
2 x Universal Power Adapters (NA/JP, EU, UK, ANZ)
2 x 3.5 mm to DB-9 RS-232 Adapters
4 x Mounting Brackets
1 x Quick-Start Guide
Shipping weight1.45 kg
Package size249 × 196 × 97 mm

Questions about this item

Will 4K at 60 Hz arrive cleanly at the full 330 ft distance?

Yes, the extender is rated for 3840x2160 at 60 Hz up to 330 ft over Cat 6 UTP; 1080p can reach 460 ft.

What cabling standard does the RJ-45 link require and what bandwidth does it carry?

It uses Cat 6 UTP cabling and transports 4K 60 Hz HDMI with HDCP 2.2 and 7.1 surround audio.

How do I mount the transmitter and receiver units in a rack or on a wall?

Four mounting brackets are included; each unit measures 4.37" x 1.02" x 3" and weighs 0.60 lbs.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Also in this aisle

People compared these

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