Is the StarTech.com CDP2VGAW USB-C to VGA Adapter compatible with Thunderbolt 3 devices?

Yes, the StarTech.com CDP2VGAW USB-C to VGA Adapter is Thunderbolt 3 compatible.

What is the maximum resolution supported by the StarTech.com CDP2VGAW USB-C to VGA Adapter?

The maximum resolution supported by the StarTech.com CDP2VGAW USB-C to VGA Adapter is 1920x1200 or 1080p.

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StarTech.com CDP2VGAW USB-C to VGA Adapter - White - 1080p - Video Converter For Your MacBook Pro / Projector / VGA Display (CDP2VGAW)

Connect your MacBook Chromebook or laptop with USB-C to a VGA monitor or projector
Works with USB C devices like MacBooks with USB Type C HP Pro Tablet 608 G1 and Thinkpad Yoga 900s
Works with VGA TVs monitors & projectors
Resolutions up to 1920x1200
USB C to VGA adapter / USB Type-C to VGA / USB 2.0 Type-C to VGA converter / USB 3.1 Type C to VGA / USB C video adapter
Thunderbolt 3 compatible
Hassle-free connection with reversible USB-C connector