What vesa size is it?

The product has VESA compatibility with M4*6mm screws.

The description doesn't give the resolution. Why is that? Is it 1440P? Or 1080P? or what?

The resolution of the monitor is 1920 x 1080.

Questions & Answers: UPERFECT 24" 120HZ Portable Monitor w/ 180°Adjustable Kickstand & VESA, Large Portable Gaming Monitor with HDMI Type C, External Portable Monitor for Laptops, Steamdeck, MacBook, Phones, Mini PC

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UPERFECT 24" 120HZ Portable Monitor w/ 180°Adjustable Kickstand & VESA, Large Portable Gaming Monitor with HDMI Type C, External Portable Monitor for Laptops, Steamdeck, MacBook, Phones, Mini PC

Innovative 23.8 Portable Monitor: Experience vibrant visuals on a stunning UPERFECT 23.8-inch display, designed for on-the-go productivity and entertainment.
120Hz High Refresh Rate: Enjoy ultra-smooth gameplay and fluid motion with UPERFECT external portable laptop monitor with 120Hz refresh rate, providing a superior visual experience for gamers and movie lovers alike.
Lightweight Travel Monitor: Weighing just 5.37 pounds, UPERFECT portable monitor 23.8 inch is your perfect companion for travel.
HDMI and Type C Plug and Play: Effortlessly connect to your devices with versatile standard HDMI and Type C ports.
0°-180° Adjustable Stand and VESA Compatibility: Using a portable monitor with stand, can customize your viewing angle with the adjustable stand, allowing for a comfortable setup whether you're working or watching videos. Plus, VESA(M4*6mm) compatibility lets you mount the monitor easily on walls or adjustable arms for enhanced flexibility.

$189^.99 –