• Startech ST121HDBTD 4K HDMI over CAT5 - USB Powered
  • Startech ST121HDBTD 4K HDMI over CAT5 - USB Powered
  • Startech ST121HDBTD 4K HDMI over CAT5 - USB Powered
  • Image of ST121HDBTD 4K HDMI over CAT5 - USB Powered ST121HDBTD 4K HDMI over CAT5 – USB Powered


$404.12 $389.16

2 in stock

6 weekly interest-free payments from $64.86 with Laybuy

Price Match

Estimated delivery time for items in stock:

  • AUCKLAND1 DayShipping $ 9.20
  • NORTH ISLAND1-2 DaysShipping $ 9.20
  • SOUTH ISLAND1-3 DaysShipping $ 9.20

Can ship same day if order before 2pm (except weekends and public holidays)

SKU: CST241, ST121HDBTD Categories: , , Tag:
  • Installs easily and discreetly, with a compact transmitter that’s USB powered and features a built-in HDMI cable
  • Maintains astonishing picture quality up to 130 feet away, with support for UltraHD 4K over non-proprietary CAT5e or CAT6 cabling
  • Ensures compatibility with your existing HDBaseT hardware, with HDCP compliance
  • Also supports HD video resolutions such as 1920×1200 or 1080p up to 230 ft. away
  • No software or drivers required with plug-and-play installation
  • Dolby® TrueHD, DTS-HD MA Audio

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Product Overview

Startech ST121HDBTD 4K HDMI over CAT5 – USB Powered

Gallery Image 1 for ST121HDBTD

Startech ST121HDBTD Description

Startech ST121HDBTD compact transmitter uses HDBaseT™ technology to extend your HDMI® signal up to 230 feet (70 meters) over a single CAT5e or CAT6 cable, to an HDBaseT display, projector or receiver (sold separately). The transmitter supports Ultra HD and Full HD video resolutions (4K and 1080p), with support for the accompanying digital 7.1 audio.

HDBaseT logo

Easy and discreet installation

For a simple and tidy installation, the HDBaseT transmitter features a small footprint and a built-in HDMI cable that connects directly to your video source, reducing clutter by eliminating the need for an HDMI cable at your local source. The transmitter is powered using USB, which means you can use a USB port on your source device to power the transmitter, which is perfect for extending from areas where power outlets may be limited.

Use your own HDBaseT display, projector or receiver

The compact transmitter works seamlessly with other HDBaseT equipment, such as HDBaseT displays, projectors, and receivers. The simplicity and versatility of this compact transmitter make it the ideal solution for transmitting an HDBaseT signal to a boardroom or classroom projector, enabling presenters in your office to quickly connect their laptop computer and share presentations or data sheets.

Seamless integration with your existing infrastructure

This transmitter extends HDMI and 7.1 surround sound over a single cable, unlike some HDMI extenders that require two cables and only offer minimal audio support. Extending HDMI with one cable reduces potential failure points while also lowering your cost in cabling.

Plus, because the HDBaseT transmitter uses standard network cables, it works with existing Ethernet infrastructures. This makes it the perfect solution for deploying digital signage in large buildings such as shopping centers, stadiums, schools or hospitals.

Astonishing 4K picture quality from an impressive distance

With high-quality HDMI cables beginning signal degradation at 30 feet, it can be difficult to maintain the brilliance of 4K video even at shorter distances. But with HDBaseT you’ll be amazed at how your Ultra HD picture, four times the resolution of high-definition 1080p, is just as brilliant, even at distances up to 130 feet from your video source.

Even if you’re not running 4K, HDBaseT supports High-Definition 1080p and lower resolutions at even greater distances, up to 230 feet from your source, giving you piece of mind to know that this extender will comfortably work with any HDMI video source and display.

What is HDBaseT?

HDBaseT is a standardized, zero-latency, video distribution technology that’s revolutionizing HDMI distribution. HDBaseT uses an advanced method of modulation that enables you to distribute uncompressed HDMI audio and video along with additional signals, over a single Ethernet cable. Offering greater versatility than traditional HDMI extenders and longer distances than HDMI cables alone, HDBaseT is the clear choice for every integrator and system designer, because it can do so much, with just a single cable.

The ST121HDBTD is backed by a 2-year warranty and free lifetime technical support.


  • Transmits your HDMI video signal from a secure location to a remote HDBaseT display, projector or receiver, in a convenient, customer-facing viewing area
  • Turns your HDMI video source into an HDBaseT signal that can be used to create brilliant digital signage displays in hospitals, shopping centers or restaurants
  • Replaces a defective HDBaseT transmitter in your existing HDBaseT infrastructure

Technical Specifications

Warranty InformationWarranty2 Years
Connector(s)1 – Local Unit ConnectorsHDMI (19 pin)
EnvironmentalOperating Temperature0°C to 40°C (32°F to 104°F)
Storage Temperature-10°C to 60°C (14°F to 140°F)
Humidity0% – 80 % RH (non-condensing)
CablingCat 5e UTP or better
Packaging InformationPackage Height1.9 in [47 mm]
Package Length6.1 in [1.6 cm]
Shipping (Package) Weight7.4 oz [210 g]
Package Width3.9 in [99 mm]
PerformanceMaximum Cable Length2.8 in [70 mm]
Max Distance70 m / 230 ft
Maximum Digital Resolutions4096 x 2160 (4K) @ 30 Hz
Wide Screen SupportedYes
Audio Specifications7.1 Surround Sound
Physical CharacteristicsMaterialSteel
Product Length12.2 in [3.1 cm]
Product Width1.4 in [35 mm]
Product Height1.0 in [25 mm]
Weight of Product3.8 oz [108 g]
PowerPower SourceUSB-Powered
What’s in the Box1 – Included in PackageHDMI transmitter
4.3 ft. [1.3 m] USB cable for power
quick start guide

Additional Details

Product Manufactured by: Startech

Product Found in: HDMI Adapters

Cackle Part Number: CST241

Manufacturer Part Number: ST121HDBTD


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