Is this compatible with macbook pro? I assume so, but people say "windows..."

Yes, I'm using it with my 17" MacBook Pro. Just connect the USB-C from the display to the computer. It will charge the laptop, and let you use the monitor as a USB hub. The only downside is that you can't control the speaker volume through software, you have to use the controls on the monitor.

Questions & Answers: LG 27UL850-W 27" Ultra HD 4K Backlit LED IPS Monitor

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LG 27UL850-W 27" Ultra HD 3840 x 2160 4K 5ms (GTG) 2xHDMI DisplayPort USB Type-C Built-in Speakers AMD Radeon FreeSync Flicker Safe HDR 400 Borderless Anti-Glare Backlit LED IPS Monitor

3840 x 2160 Ultra HD 4K Resolution @ 60Hz
5ms Response Time
2 x HDMI, DisplayPort, USB Type-C Video Inputs
2 x USB 3.0 Type-A Ports
Built-in 5 Watt Speakers
DisplayHDR 400
AMD Radeon FreeSync Technology
Flicker Safe Technology
Pivot, Tilt, Height Adjustable
VESA Mount Compatible

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