Does this splitter only duplicate the display from the source to the other monitors or will it allow the two others monitors to become an extension of the first?

This is a splitter only. Most HDMI outputs would not support dual output at 4k. If you have a Displayport or mini displayport on your computer that can handle the bandwidth requirements for sure, but the video card in a laptop or older desktop may not be powerful enough to support two 4k displays. Ilford instance a windows surface pro 2 had trouble running dual output to 1080P screens but my GTX980 runs two 4k monitors well to watch a 4k movie and brows the web simultaneously, but not game at decent frame rates while watching a 4k movie.

Will this device allow you to extend the image between two monitors?

not sure what you mean by extend..The unit will display one single video source on 2 separate monitors the video stream can be as large as 2160P@30hz.

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Main image of StarTech.com ST122HD4KU HDMI Splitter 1 In 2 Out - 4k 30Hz - 2 Port - Supports 3D video - Powered HDMI Splitter - HDMI Audio Splitter

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StarTech.com ST122HD4KU HDMI Splitter 1 In 2 Out - 4k 30Hz - 2 Port - Supports 3D video - Powered HDMI Splitter - HDMI Audio Splitter

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Style: 2 port - 4K 30Hz (Dongle)

2 port - 4K 30Hz
2 port - 4K 30Hz (Dongle)

Split an HDMI audio/video source to two separate HDMI Displays with support for HDMI 4K and Power through a nearby USB port
Compatible with 4K HDMI video source devices such as desktop and laptop computers and 4K HDMI Televisions and Monitors
Backward compatibile with High-definition 1080p video sources and displays
Supports video resolutions up to 4K
1x2 HDMI Splitter / 2-port HDMI Splitter / 4K HDMI Splitter / USB Powered HDMI Splitter / 4K at 30Hz

Overview

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MAIN OVERVIEW FEATURES: Maximum
Frequency: 30 HzMaximum
Video Resolution: 3840 ? 2160HDMI
In: YesHDMI
Out: YesNumber of
HDMI Inputs: 1Number of
HDMI Outputs: 2Input
Voltage: 5
V DCHeight: 0.7"W
idth:
2"Length: 24.4"W
eight (Approximate): 2.80 ozPackage
Contents: 2-Port HDMI Splitter with USB Power-4K 1 x Universal Power Adapter (NA/EU/UK/AU) 1 x USB Power Cable 1 x Instruction
Manual Environmentally Friendly: YesEnvironmental
Certification: RoHSREACHWEEE
Limited Warranty: 2 Year

Model
Brand	StarTech.com
Series	ST122HD4KU
Model	ST122HD4KU
Part Number	ST122HD4KU

Details
Type	StarTech.com 4K HDMI Splitter 1 In 2 Out - 4K 30Hz HDMI 1.4 2 Port Video Splitter Box -with high speed HDMI cable, USB power cable - Black (ST122HD4KU), HDMI
Changer Type	HDMI
Ports	2 Ports Plastic
Audio	StarTech.com 4K HDMI Splitter 1 In 2 Out - 4K 30Hz HDMI 1.4 2 Port Video Splitter Box -with high speed HDMI cable, USB power cable - Black (ST122HD4KU)
Industry Standards	on_product_combined_cancer_reproductive
Color	Black
Cable Length	No
Specifications	StarTech.com 4K HDMI Splitter 1 In 2 Out - 4K 30Hz HDMI 1.4 2 Port Video Splitter Box -with high speed HDMI cable, USB power cable - Black (ST122HD4KU), ST122HD4KU, 2, HDMI, 24.4 L x 2 W x 0.7 H inches, 0.078 kilograms, Black, 2 Year, 5.2 L x 15.2 W x 21.8 H centimeters, 0.38 kilograms

Connectors
Input Connector	HDMI x 1
Output Connector	HDMI x 2
Connector Style	HDMI

Performance
Maximum Cable Length	2 Port

Features
Features	Split an HDMI audio/video source to two separate HDMI Displays with support for HDMI 4K and Power through a nearby USB port Compatible with 4K HDMI video source devices such as desktop and laptop computers and 4K HDMI Televisions and Monitors Backward compatibile with High-definition 1080p video sources and displays Supports video resolutions up to 4K 1x2 HDMI Splitter / 2-port HDMI Splitter / 4K HDMI Splitter / USB Powered HDMI Splitter / 4K at 30Hz

Dimensions & Weight
Dimensions	24.4 in x 2 in x 0.7 in
Weight	0.75

Package Contents
Package Quantity	1

Disclaimer
Disclaimer	on_product_combined_cancer_reproductive

Additional Information
First Listed on Newegg	August 01, 2024

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Item#: 9SIA6ZPK9W6132

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StarTech.com ST122HD4KU HDMI Splitter 1 In 2 Out - 4k 30Hz - 2 Port - Supports 3D video - Powered HDMI Splitter - HDMI Audio Splitter

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Customer Reviews of the STARTECH ST122HD4KU

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