Gaming phones are a rare breed , and the nascent category has already proved to be too much of a challenge for Razer . Some companies still see it as an opportunity to tap into the ever-growing esports market, however. Devices land with gimmicks like detachable controllers on Xiaomi's Black Shark 2 , or a built-in cooling fan on the Nubia Red Magic 3 . Neither could top last year's ASUS ROG Phone though when it comes to accessories: It offered a clip-on fan, a WiGig screen-casting dock, a clamp-on controller pad, a mobile desktop dock and a bizarre dual-screen dock. ASUS never shared sales figures for the ROG Phone, but it must have done well enough to warrant a sequel packed with many upgrades. The ROG Phone II is the world's first smartphone with a 120Hz AMOLED display, and it's also the first to feature the more powerful Snapdragon 855 Plus chipset. Another first here is the integration of two vibration motors, just, it hopes. to make gaming a tad more immersive.