here!
I’m your shopping assistant for PC builds, upgrades, and everything tech.
Got questions? Ask away!
Start a conversation
Best Sellers
Top Rated- $519.50
Hot Seller- $524.02
- + FREE SHIPPING
StarTech.com HDMI Over CAT6 Extender - Power Over Cable - Up to 100m (330 ft.) ST121HDBT20L
- Extend HDMI over CAT5/CAT6 cabling to a remote location with support for 4K 60Hz at 70m / 230 ft. and 1080p 60 Hz at 100m / 330 ft.
- Hassle-free setup with video and power over a single CAT5e or CAT6 cable
- Sleek professional installation with optional mounting hardware included with the 4K HDMI extender over CAT6
- HDMI extender over CAT6 / 4K HDMI over CAT6 / HDMI extender over CAT5 / 4K HDMI over CAT5 / 4K HDMI over Ethernet / HDMI signal booster / HDMI repeater / Video extender
+
+
Overview
Specs
Reviews
See all Q & A 
Any questions? Ask CelesteSM will help you find out quickly.
Try me now
Extend HDMI over CAT6 cabling to a remote location with support for 4K60Hz at 23
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 2 years
- Limited Warranty period (labor): 2 years
- Read full details
Return Policies
- Return for refund until: January 31, 2026
- Return for replacement until: January 31, 2026
- This item is covered by Newegg.com's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2025 and December 31, 2025 you will have until January 31, 2026 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-800-265-1844
- Support Email: support@startech.com
- Support Website
- View other products from STARTECH
LOADING...
LOADING...
The StarTech.com ST121HDBT20L is an HDMI-over-CAT5e/CAT6 extender for sending video to a remote display, supporting 4K at 60 Hz up to 70 m (230 ft.) or 1080p at 60 Hz up to 100 m (330 ft.). It suits home, office, and professional AV setups that need long-distance display connections over one cable.
Recommended For
- AV installers fitting a conference room, classroom, or similar space can place an HDMI source away from a remote display and carry the signal over an existing Cat5e/Cat6 cable run.
- Digital-signage operators who need to locate a display far from its HDMI source can use one Cat5e/Cat6 cable for the connection, with 4K at 60Hz supported up to 70m and 1080p at 60Hz up to 100m.
- Installers working where the remote display has limited access to power can benefit from Power over Cable, which lets the transmitter and receiver share a single power adapter connected at either end.
- Users who need to control a source device from the display location, such as a presenter using equipment installed elsewhere in the room, can use the included IR receiver and blaster for remote-control extension.
Real-World Use Scenarios
- In a school or meeting room, connect a presentation source at one end of the room to a distant projector or display; the Cat cable carries the HDMI signal without requiring a long HDMI run.
- For digital signage in a large building, keep the media player in a convenient equipment area and send its picture to a remote screen over existing Cat5e or Cat6 cabling; the displayed resolution depends on the cable distance.
- In a retail, stadium, school, or hospital installation, place a display far from the video source without running a long HDMI cable; this can simplify connecting screens across a building.
- Where there is limited access to power near the receiver, power the extender through the Cat cable from the other unit; this avoids needing a separate outlet for the receiver, but not for the display itself.
- When the source device is stored away from the screen, use the included IR accessories to control that source from the remote display location.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Extending HDMI video to a remote display over CAT5e or better cabling, with support for 4K at up to 70 m or 1080p at up to 100 m |
| Video Resolution And Distance | Supports 4096 × 2160 (4K) at 60 Hz up to 70 m and 1080p at 60 Hz up to 100 m; also lists 3840 × 2160 at 60 Hz, 2560 × 1600, 1920 × 1200 at 60 Hz, and 1280 × 720. Maximum cable length is listed as 328.4 ft. and maximum distance as 330 ft. |
| Connections And Signal Extension | Transmitter has one female HDMI input and one female RJ-45 output; receiver has one female RJ-45 input and one female HDMI output. Uses CAT5e UTP or better cabling and supports IR extension for remote source control |
| Audio Support | Supports audio, including 7.1-channel surround sound |
| Power And Consumption | Includes an AC adapter; 100–240 V AC input, 18 V DC output at 1 A, 0.6 A input current, and 18 W power consumption |
| Design And Installation | Black aluminum housing; includes transmitter and receiver, universal power adapter, IR blaster and receiver, two mounting brackets, eight rubber feet, and a quick-start guide |
| Dimensions And Weight | 4 × 3 × 1 in. and 0.24 lb. |
| Operating Environment | Operating temperature: 0–40 °C; storage temperature: −10–60 °C; humidity: 0–80% RH, non-condensing |
| Status Indicators | One status LED on the local unit and one on the remote unit |
| Model Identifiers | StarTech.com ST121HDBT20L |