I added a portable monitor next to my main display and this inexpensive upgrade is a game changer

Portable monitors make working on the go easier but they’re also a more affordable stand-in for a traditional display when desk space is limited.
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Aura Triple Aero 15.6" Pro Max

All three screens are 15.6-inch in-plane switching (IPS) panels with a 16:9 aspect ratio and Full HD (aka 1080p) resolution.