KYY X90D 15.6″ Triple Portable Monitor Review: Inexpensive 1080p Dual Monitors that Turn Laptops into a Triple Screen Treat

KYY X90D 15.6″ Triple Portable Monitor review

For a more expensive product, I would be more critical. I didn’t find any issues with the KYY X90D 15.6″ Triple Portable Monitor. It performed as expected. It is not, as the Amazon and company websites suggest, a “triple monitor,” rather it turns a laptop into a “triple monitor” device by adding two additional 1080p displays. While the 1080p displays are fine as far as they go, those with higher resolution laptops may want higher resolution external displays. I started with the caveat that it was for a more expensive product. It’s hard to complain about features that are clearly stated, for a pair of displays that cost only about $240 at a discount ($350 list).

The KYY X90D’s solid aluminum construction is durable, and the hinge isn’t under-engineered for the weight of the displays. The weight isn’t specified, but it feels like carrying a second laptop. However, compared to the days of carrying CRT monitors for conferences, it’s extremely svelte.

I am particularly fond of the triangular configuration, which doesn’t help me much but does give off a cool Star Trek vibe with a video conference or presentation duplicated across the three screens so everyone can view the speaker or see the data. My wish list: AI microphones and cameras in each display so that it can switch inputs based on who is talking, rather than showing everyone the same view. Next version, perhaps.

My X90D is now connected to a Thunderbolt hub, so anything I attach to the hub receives the benefits of extra dual HD displays as long as I remember to install the app or plug in a machine that already manages the interface.

What we like

Pros

• Dual 15.6″ 1080p IPS screens with 300 nits brightness, metal frame
• Simple single‑USB‑C setup, includes extra USB‑C to A and wall adapter
• Sturdy, adjustable hinge and kickstand; supports up to 17.3″ laptops
• Versatile display modes (extended, mirror, portrait, single, preset modes)
• Budget pricing

Each of the KYY X90D’s 15.6-inch displays features a 1920×1080 Full HD IPS panel with a claimed brightness of 300 nits. While the actual brightness trends lower, the panels still offer respectable contrast, good color accuracy with a 72% NTSC gamut, and wide viewing angles. The 60Hz refresh rate handles business, creative, and content workflows smoothly. The matte anti-glare finish reduces reflections in most indoor environments, giving the screen utility even when the lighting isn’t ideal. The dual-screen design creates a panoramic workspace that increases productivity, particularly for multitasking, coding, or reviewing documents side-by-side.

The KYY X90D leans into simplicity with its single USB-C connection that handles both power and video when plugged into a compatible laptop. For devices that don’t support DisplayPort Alt-Mode over USB-C, KYY includes a second USB-C to USB-A cable and a 30W wall adapter, ensuring that older machines aren’t left behind. This makes the device more inclusive for a wide range of users across platforms—Windows, macOS, and Android are supported out of the box. I didn’t have to hunt for extra adapters or worry about compatibility, which made setup fast and frictionless.

The KYY X90D’s hinge and kickstand design make the 12″D x 17.3″ W x 3.74” H X90D physically adaptable. With its integrated folding stand and independently rotating arms, it supports laptop sizes from 13 to 17.3 inches. The screens stayed stable without needing additional props. The hinges feel sturdy, resisting both sag and wobble over extended use. That matters when you’re relying on side panels for a full-day workflow and not just as a momentary display gimmick.

Display flexibility extends into the digital realm. The KYY X90D supports multiple viewing modes, including mirror, extended, portrait (when used individually), and a unique “pre-mode” setting that saves preferred configurations. I appreciated the ability to adjust how content is displayed without needing to dive into my OS settings. For presenting, monitoring multiple applications, or tracking multiple data streams at once, the modularity in viewing modes proved genuinely useful rather than a checklist item.

At a typical retail price of $250–$319, depending on the vendor, the KYY X90D comes in well below the cost of most comparable “triple-screen” setups. There’s genuine value here, especially given the build quality, screen size, and included accessories. For budget-conscious buyers who need real estate but aren’t ready to haul around a full docking station or dedicated desktop monitors, this hits the sweet spot. The value proposition isn’t just about price—it’s about what you can do with a modular, dual-screen rig that travels easily.

What could be improved

Cons

• The configuration button placement feels awkward near the hinges
• Brightness lower than claimed—often around ~180 nits
• No protective case included
• Lacks HDMI input; relies solely on USB‑C with DisplayPort Alt‑Mode

The location of the on configuration buttons undermines an otherwise solid hardware design. They’re tucked into the back corners near the panel hinges, which makes them difficult to see and even harder to press without lifting or twisting the monitors awkwardly. Navigating settings like brightness, contrast, and color profiles requires patience and dexterity, not ideal for on-the-fly adjustments in the middle of a work session. Given how central these controls are to adapting the displays to different lighting conditions or color-critical tasks, their placement feels like a usability afterthought.

Despite the spec sheet claiming the KYY XD90 puts out 300 nits of brightness, real-world experience tells a different story. In standard mode, the panels appear dimmer than I would expect, and the brightest presets like “Game” and “Vivid” only slightly turn up the visual heat. The panels are adequate for indoor use under moderate lighting, but fall short in environments with natural light or brighter overhead fixtures. For a mobile display that’s meant to be used on the go, inconsistent brightness performance limits where and how comfortably it can be used.

The KYY X90D ships with all the necessary cables and power accessories, but it leaves out any form of protection. There’s no sleeve, case, or screen guard included, which feels like a miss for a product whose core value lies in its portability. The panels do fold inward, so the displays are not exposed, and the handle turns a folder X90D into a case of sorts.

However, transporting dual 15.6-inch glass surfaces without protection is a risky proposition, especially if you’re sliding them into backpacks or carry-ons with other gear. Without buying a third-party solution or improvising your own, there’s a good chance these displays could suffer cosmetic or structural damage during routine travel. Most of the other portable displays reviewed on Serious Insights shipped with a magnetic wrapper (notably those from ViewSonic) or slide-over cover. I add a cover to any display I travel with, regardless of its built-in protective features.

While USB-C simplifies connection for modern devices, the lack of any HDMI input reduces the X90D’s flexibility. Many business laptops, desktops, and older devices still rely on HDMI for video output, and by not including even a mini-HDMI port, KYY effectively shuts out a wide segment of potential users. This constraint forces some buyers into dongle or hub territory just to use the product at all. In a market that increasingly values universal compatibility, relying solely on USB-C with DisplayPort Alt Mode feels overly restrictive. While a significant issue for some with legacy devices, it should not be a problem for those who own more modern devices with USB-C and Thunderbolt.

My Lenovo Aura laptop connected immediately to the displays without the need for a driver. A Dynabook Tecra A40-M connected, but required the drivers, and has worked well since. Those seeking legacy support need to look to other solutions. Once I got the app loaded on the MacBook Pro, it also worked well in mirror or extended display mode.

I would also like to see KYY scrap much of the plastic associated with shipping, instead using recyclable materials between the displays to protect them during shipping, and paper tape to hold the box together rather than a full plastic wrap on the rather large footprint box.

KYY X90D 15.6″ Triple Portable Monitor: The bottom line

The KYY X90D delivers ambitious multi‑screen portability without demanding a wallet‑crushing price. Its dual‑panel IPS design, configuration versatility, and compatibility make it a compelling tool for mobile professionals. Yet ergonomic missteps, like button placement, lower-than-promised brightness, and minimal protection, temper the enthusiasm. If you’re after productivity on the go, own a USB-C-based device with DisplayPort-Alt Mode/Thunderbolt and can manage careful handling, it’s a solid dual‑monitor travel rig that will enhance productivity. or provide a multi-screen display for a conference booth.

KYY provided the X90D 15.6″ Triple Portable Monitor for review. Images courtesy of KYY unless otherwise noted.

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