Is this adapter compatible with macOS devices, and what versions does it support?

Yes, the adapter is compatible with macOS devices and supports macOS Mojave (10.14), macOS Catalina (10.15), macOS Big Sur (11.0), macOS Monterey (12.0), and macOS Ventura (13.0).

What is the maximum resolution supported by this USB to Dual HDMI Adapter?

The adapter supports dual HDMI video outputs with one output at 4K 30Hz and the other at 1080p.

Questions & Answers: StarTech.com USB to Dual HDMI Adapter, USB A/C to 2x HDMI Displays (1x 4K30Hz, 1x 1080p), Integrated USB-A to C Dongle, 4in/11cm Cable, USB 3.0 to HDMI Display Adapter, Windows & macOS

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StarTech.com USB to Dual HDMI Adapter, USB A/C to 2x HDMI Displays (1x 4K30Hz, 1x 1080p), Integrated USB-A to C Dongle, 4in/11cm Cable, USB 3.0 to HDMI Display Adapter, Windows & macOS

T PRO PERFORMANCE: USB to Dual HDMI Display adapter built with Silicon Motion's Content Adaptive Technology uses multiple processing algorithms resulting in minimal CPU usage, low latency for smoother lag free graphics (i.e. mouse and window movement)
INCREASED PRODUCTIVITY: Add dual displays to almost any laptop with the integrated USB-A or USB-C adapter dongle; Enable extended dual displays on Apple M1/M2 MacBook which are not natively capable of driving more than one external display
SPECS: Dual HDMI video outputs with 1x 4K 30Hz & 1x 1080p; This USB to Dual HDMI Adapter uses a single USB 3.0/3.2 Gen 1 (5Gbps) connection or later; 2ch HDMI Audio; USB bus-powered, no power supply required; 4" (11cm) attached cable
EXTERNAL VIDEO GRAPHICS ADAPTER: Connect additional displays when extra video ports are not available on a laptop or dock; Use with two external monitors and a workstation laptop screen; Ideal for business productivity apps, not ideal for gaming

$84^.06 –