ASUS ROG Strix XG349C

Name: ASUS ROG Strix XG349C
Brand: ASUS

Here is a closer look at ASUS ROG Strix XG349C.

About

A 3440x1440 IPS ultrawide with native USB-C DP Alt Mode — sidesteps OLED burn-in risk entirely, but its scaler pillarboxes a 16:9 handheld signal rather than filling the screen, and its USB-C port carries too little power for sustained handheld charging.

DP Alt Mode: Yes
Max resolution: 3440x1440@180Hz
Requires DisplayLink driver: No

Ports: 1× DisplayPort, 1× HDMI and 1× USB-C

Confirmed with

Notebook (generic)
The internal scaler pillarboxes a standard 16:9 signal with side black bars rather than any kind of intelligent fill — expected behavior, but a real limitation for anyone hoping to fill the ultrawide frame. USB-C Power Delivery output is too low to sustain a high-performance handheld under real gaming load, resulting in a slow battery drain even while connected.