In original packaging item, may require some assembly. See link for more details:

Size: 16.0" 

Note: Tested, powers on, and displays.

https://www.bestbuy.com/product/acer-pm161w-16-0-wuxga-60hz-freesync-compatible-ips-portable-monitor-2-x-usb-3-1-type-c-mini-hdmi-audio-out-black/JJ8V8HXR3V