ASUS Zenbook S UX391

ASUS Zenbook S UX391
ZenBook S UX391FA
Finish / Color

ZenBook S UX391FA

Deep Dive Blue

Operation System

Windows 10 Pro
(ASUS recommends Windows 10 Pro for business)

Windows 10 Home


Intel® Core™ i7-8565U processor

1.8GHz Quad-core with Turbo Boost (up to 4.6GHz) and 8MB cache

Intel® Core™ i5-8265U processor

1.6GHz Quad-core with Turbo Boost (up to 3.9GHz) and 6MB cache


Integrated Intel® UMA Graphics


13.3” LED-backlit 4K UHD (3840 x 2160) 16:9 glossy touchscreen

13.3” LED-backlit Full HD (1920 x 1080) 16:9 glossy screen

13.3” LED-backlit Full HD (1920 x 1080) 16:9 anti-glare screen

5.9mm-thin bezel with 85% screen-to-body ratio

Wide 100% sRGB color gamut

178° wide-view technology

ASUS Eye Care technology for up to 30% blue-light reduction


8GB / 16GB 2133MHz LPDDR3 onboard


1TB / 512GB / 256GB PCIe® SSD


2 x Type-C™ USB 3.1 Gen 2 (Thunderbolt™)

1 x Type-C™ USB 3.1 Gen 2

All three ports support fast charging, data transfers and display connectivity.

Thunderbolt™ 3 USB-C™ USB 3.1 Gen 2 Type-C™ Audio combo jack
Keyboard and Touchpad


Full-size backlit, with 1.2mm key travel


Glass-covered with integrated fingerprint sensor supporting Windows Hello; intelligent palm-rejection

Precision Touchpad (PTP) technology supports up to four-finger smart gestures

Keyboard Touchpad Fingerprint

ASUS SonicMaster stereo audio system with surround-sound; smart amplifier for maximum audio performance

Array microphone with Cortana and Alexa1 voice-recognition support

3.5mm headphone jack

Long-travel voice coils for improved low-frequency response

Certified by Harman Kardon


HD webcam

Wireless Connectivity


Dual-band 802.11ac gigabit-class Wi-Fi


Bluetooth 5.0

Battery and Power

Up to 19.4 hours battery2

50Wh 4-cell lithium-polymer battery

65W power adapter
Plug Type: Type-C
(Output: 19V DC, 65W)
(Input: 100-240V AC, 50/60Hz universal)

Weight and Dimensions

Height: 1.29cm (0.51 inches)

Width: 31.1cm (12.24 inches)

Depth: 21.3cm (8.39 inches)

With anti-glare display: Approx. 1kg (2.20 pounds)
With glossy display: Approx. 1.05kg (2.31 pounds)

31.1 cm
(12.24 inches)
21.3 cm
(8.39 inches)
1.29 cm
(0.51 inches)
Included in the Box

ZenBook S (UX391)

Protective sleeve

USB-C™ power adaptor (65W)

ASUS Mini Dock
(or USB-C™ to USB-A dongle and USB-C™ to HDMI dongle)

ASUS Pen (optional)

Included Software

ASUS Battery Health Charging

ASUS Splendid

Quiet Fan

  • Amazon Alexa support varies according to country and territory. Please check with your local ASUS retailer for details.
  • Battery life test configuration: Intel® Core™ i5-8265U, 8GB RAM, Full HD non touch display, 256GB PCIe® G3*2 SSD. Battery tests conducted by ASUS in December 2018 using the Intel Battery Life Measurements(Rev 1.0)-Local Video Playback Scenario. Test settings: Wi-Fi disabled, display brightness set to 150 nits, with headphone plugged in. Actual battery life may vary depending on product configuration, usage, operational conditions and power management settings. Battery life will decrease over the lifetime of the battery.
  • Weights may vary according differ by to product specifications.