Is the signal directional? Meaning can the AV receiver and TV send signal to each other both way?

The product does not support bidirectional signal transmission. It is designed to extend HDMI up to 230ft (70m) over a single CAT5 cable, and there is no mention of bidirectional signal capability.

I need to purchase another power supply adapter. Can you direct me to a place to purchase one? Or can you tell me what is the barrell size of the plug?

i Reply dont know where to buy a PS, sorry i recommend contacting startech 800-number

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STARTECH;ST121HDBTE;ST121HDBTE The ST121HDBTE HDMI® over C

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Option: 230 ft. Distance

230 ft. Distance
330 ft. Distance

Extend HDMI up to 230ft. (70m) over a single CAT5 cable with HDBaseT
Supports video resolutions up to 1080p
HDBaseT Extender / HDMI over single CAT5 or CAT6 Ethernet Extender / Power Over Cable / HDMI Extender Over CAT5 or CAT6 / POC Extender / HDBaseT CAT5
Works at distances up to 230 feet (70 meters)
Requires one power adapter for both the transmitter and receiver
Cost-effective HDMI extension through non-proprietary network cabling
Mounting hardware included for tidy installation

Overview

Specs

Reviews (5)

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Extend HDMI up to 230ft (70m) over a single CAT 5e / Cat 6 cable with Power over

Model
Brand	StarTech.com
Model	ST121HDBTE

Performance
Distance	70m / 230 ft. (Max)
Resolution Support	4096 x 2160 (4K) @ 30 Hz
Audio	7.1 Surround Sound

Indicater
LED Indicator	1 x Power Indicator

Power
Power Supply	Center Tip Polarity: Positive Input Current: 0.5A Input Voltage: 100 ~ 240 AC Output Current: 1.5A Output Voltage: 12 DC Plug Type: M Power Source: AC Adapter Included

Specification
Specification	Hardware Audio: Yes Cabling: Cat 5e UTP or better Daisy-Chain: No Output Signal: HDMI Ports: 1 Performance Maximum Cable Length: 0.2 ft. [0.1m] Wide Screen Supported: Yes Connector(s) Connector A: - 1 x HDMI (19 pin) Latching Female - 1 x RJ-45 Female Connector B: - 1 x HDMI (19 pin) Female - 1 x RJ-45 Female Environmental Humidity: 0% - 80 % RH (non-condensing)

Feature
Feature	Extend video where power outlets are limited with power over cable that powers both the transmitter and receiver using a single power source at either side of the connection Maintains astonishing picture quality up to 115 ft. (35m) away, with support for UltraHD 4K over non-proprietary CAT5e or CAT6 cabling Also supports HD video resolutions such as 1920 x 1200 or 1080p at distances up to 230 ft. (70m) Hassle-free, professional installation with included mounting brackets, and full video extension over one CAT5 cable 70m (230 ft.) maximum Cat5 cable distance No software/drivers required Mounting Hardware Included Dolby TrueHD, DTS-HD MA Audio

Dimensions & Weight
Dimensions	0.98" x 2.64" x 3.15"
Weight	0.68 lb.

Package Contents
Package Content	1 x HDMI over CAT5e/6 transmitter unit 1 x HDMI over CAT5e/6 receiver unit 1 x mounting bracket kit 1 x universal power adapter (NA/EU/UK/AU) 1 x Cat5e cable 1 x instruction manual

Additional Information
First Listed on Newegg	October 24, 2013

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

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.

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.

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StarTech.com ST121HDBTE HDMI over CAT5 HDBaseT Extender - Power over Cable - Ultra HD 4K

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Customer Reviews of the STARTECH ST121HDBTE

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16815158379

Best Sellers

StarTech.com ST121HDBTE HDMI over CAT5 HDBaseT Extender - Power over Cable - Ultra HD 4K

Learn more about the STARTECH ST121HDBTE

Customer Reviews of the STARTECH ST121HDBTE

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info