The Sero's portrait mode is perfect for YouTube, TikTok, or workouts. Credit: Samsung Deal pricing and availability subject to change after time of publication. Learn more about how we select deals.

Samsung has shown off a new, ultra-fast gaming monitor at Mobile World Congress (MWC) with a sky-high refresh rate of 500Hz. But this isn't some low-contrast TA panel, but an OLED design, which means ...