ASUS recommends Windows 10 Pro for business.

    ASUS ZenBook S UX391UA

    ZenBook S UX391UA
    Finish / Color

    ZenBook S UX391UA

    Deep Dive Blue, Burgundy Red

    Operation System

    Windows 10 Pro
    (ASUS recommends Windows 10 Pro)

    Windows 10 Home


    Intel® Core™ i7-8550U processor

    1.8GHz quad-core with Turbo Boost (up to 4.0GHz) and 8MB cache

    Intel® Core™ i5-8250U processor

    1.6GHz quad-core with Turbo Boost (up to 3.4GHz) and 6MB cache


    Integrated Intel® UHD Graphics 620


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

    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 (Deep Dive Blue only)

    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 PCIe® SSD

    256GB SATA3 SSD


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

    1 x Type-C™ USB 3.1 Gen 1

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

    Thunderbolt™ 3 USB-C™ USB 3.1 Gen 1 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 Wi-Fi


    Bluetooth 4.2

    Battery and Power

    Up to 13.5 hours battery life2

    50Wh 4-cell lithium-polymer battery

    65W power adapter
    (Output: 20V 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™ i5-8250U, 8GB RAM, Full HD display, 256GB SATA SSD. Battery tests conducted by ASUS in December 2017 using the MobileMark® 2014 Office Productivity scenario. Test settings: Wi-Fi enabled, display brightness set to 71%. 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.