Does this monitor support FreeSync and what is its refresh rate?

Yes, it supports FreeSync and has a 144 Hz refresh rate.

What is the screen size and resolution of this BenQ monitor?

It has a 23.8-inch screen with a Full HD 1920 x 1080 resolution.

Questions & Answers: Refurbished: BenQ 23.8 1080p FHD Tilt Stand, Flicker-free and FreeSync Matte Display Screen 144 Hz 250 nits with HDMI, DisplayPort, USB-C Eye-Care Home Office Monitor, Black - GW2490C

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Item#: 0JC-002S-002E9
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BenQ 23.8 1080p FHD Tilt Stand, Flicker-free and FreeSync Matte Display Screen 144 Hz 250 nits with HDMI, DisplayPort, USB-C Eye-Care Home Office Monitor, Black - GW2490C

23.8" FHD 1920 x 1080 IPS LED backlight
Brightness 250 nits Viewing Angle 178°/178° Contrast 1500:1
Response Times 5 ms Refresh Rate 144 Hz
Aspect Ratio 16:9 Display Colors 16.7 million color
Matte Display Screen 1.4 HDCP Tilt Stand, Flicker-free and FreeSync

$84^.99 –