does this have built in speakers?

No built-in speakers, but this is one awesome monitor.

What is the highest and lowest position this monitor can adjust to?

The monitor can adjust its height by 130mm.

will g sync work on this monitor?

This monitor supports AMD FreeSync (AMD Adaptive Sync) but does not mention G-Sync compatibility.

Questions & Answers: AOC C27G2Z 27" Curved Frameless Ultra-Fast Gaming Monitor, FHD 1080p, 0.5ms 240Hz, FreeSync, HDMI/DP/VGA, Height Adjustable, 3-Year Zero Dead Pixel Guarantee, Black, Xbox PS5 Switch

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AOC C27G2Z 27" Curved Frameless Ultra-Fast Gaming Monitor, FHD 1080p, 0.5ms 240Hz, FreeSync, HDMI/DP/VGA, Height Adjustable, 3-Year Zero Dead Pixel Guarantee, Black, Xbox PS5 Switch

27" AOC Gaming G2 series monitor with 1920x1080 Full HD (1080P) Resolution Curved VA panel
Rapid 0.5ms response time (MPRT) and 240Hz refresh rate with AMD FreeSync for extremely fast responses that reacts with flawless graphics for an ultra-smooth competitive gameplay
1500R curved monitor wraps around your vision for an immersive gaming experience
3-Sided frameless design with an incredibly high 80 Million to 1 contrast ratio for vivid visuals
RE-SPAWNED Warranty: 3-year zero-bright-dot, 3-year advance replacement, 1-year (one-time) accidental damage
AOC Low Input Lag delivers lag free display from the video signals
AOC LowBlue Mode and FlickerFree for wellbeing during extended gaming sessions

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