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ASUS ZenFone 4 Pro, 5.5-inch, FHD IPS, 6GB RAM, 64GB storage, Dual SIM, Unlocked Cell Phone, US/Canada Warranty, Pure Black (ZS551KL-S835-6G64G-BK)

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  • Fascinating Photo with Ease - With build in 10x Zoom., 8x Light Sensitivity, Sony flagship IMX362 image sensor, there is no need to carry another camera with you! This even works in low light environment!
  • For Selfie Lovers - With build in fast, phase-detection auto-focus Sony IMX319 image sensor, and the unique ASUS SuperPixel Engine, taking beautiful selfie has never been easier!
  • Top Performance & Efficiency - With the latest Qualcomm Snapdragon 835 as processor, Zenfone 4 Pro could even handle the most demanding apps and mobile games with ease!
  • Ultrafast network connectivity - With Cat 12 LTE Advanced cellular networking, ZenFone 4 Pro could even work as a portable Wi-Fi hotspot and share connectivity with other mobile devices!
  • Long Lasting Battery - Build in 3600mAh Battery, which allows you to have 21HR of video playbacks, 17HR of web browsing, with 5 minute Qick Charge that allows 2HR of talk time!
10x Zoom. 8x Light Sensitivity. 6GB RAM.

ZenFone 4 Pro is the ultimate expression of ASUS smartphone design, crafted to provide luxury in every detail and featuring dual cameras to deliver an unparalleled mobile photography experience. ZenFone 4 Pro has a standard camera with the Sony flagship IMX362 image sensor, an F1.7 aperture lens and a 10x total zoom capability, plus a front-facing selfie camera with fast phase-detection auto-focus, enabling you to capture gorgeous photos that rival professional cameras. ZenFone 4 Pro is the world's first smartphone to incorporate three high-end Sony image sensors, and the ASUS SuperPixel™ Engine ensures up to 8x brighter photos in low light. Powered by the latest Qualcomm® Snapdragon™ S835 mobile platform and 6GB RAM, ZenFone 4 Pro delivers a smooth and responsive camera experience, and the best performance with today's apps and games.

Dual Rear Cameras
See a bigger and brighter world

ZenFone 4 Pro features dual cameras to take your mobile photography to new heights. It is equipped with the industry-leading Sony IMX362 image sensor to capture up to 8x* brighter and clearer photos in low light. When you need to get closer, switch instantly to the 16MP camera with a 2x optical zoom and 10x total zoom to shoot beautifully detailed telephoto pictures. Both camera lenses are covered with extremely durable sapphire glass to protect against scratches. Qualcomm Spectra™ image signal processing improves your photography experience even further, providing smoother zooming, faster auto-focus, and photos with gorgeous, true-to-life colors.

* Compared to typical smartphone camera with 16MP resolution, F1.7 aperture and 1.12µm pixel size.

ZenFone 4 Pro (ZS551KL)
ZenFone 4 Pro (ZS551KL)
ASUS SuperPixel™ Camera
8x brighter and
clearer photos in low light

To capture real-world authenticity, ZenFone 4 Pro packs a main camera with a wide F1.7 aperture, the latest Sony® IMX362 image sensor with a large 1.4µm pixel size, and a six-element lens that allows more light to reach the sensor. Together with ASUS SuperPixel™ Engine that effectively increases captured light by up to 8x*, and optical image stabilization (OIS) that enables shooting photos with slower shutter speeds than normally possible, ZenFone 4 Pro captures sharper, brighter and clearer photos at night and in low-light environments.

* Compared to typical smartphone camera with 16MP resolution, F1.7 aperture and 1.12µm pixel size.

ZenFone 4 Pro (ZS551KL)ZenFone 4 Pro (ZS551KL)
ZenFone 4 Pro (ZS551KL)
PixelMaster Technology
Capture reality, fast and steady

The camera on ZenFone 4 Pro lets you capture the world as you see it by TriTech+™ technology. With ultrafast, dual pixel phase-detection, subject-tracking, and laser auto-focus, ZenFone 4 Pro accurately focuses in just 0.03 seconds and keeps moving subjects in focus to ensure clear and detailed photos. Together with both optical and electronic image stabilization for blur-free photos and videos, an RGB color-correction sensor for true-to-life colors, and true 4K UHD video recording, the camera on ZenFone 4 Pro goes above and beyond other smartphones.

ZenFone 4 Pro (ZS551KL)ZenFone 4 Pro (ZS551KL)
PixelMaster Camera Modes
Shoot like a pro, capture the fun

ZenFone 4 Pro's camera features optional manual controls similar to those found on DSLRs, giving you pro-level creative control over your photography. Pro mode provides complete camera control with one-touch adjustments to shutter speed, white balance, exposure and ISO settings, as well as the option to shoot in RAW format, allowing you to capture stunning images that truly express your photographic vision. In addition to its advanced, manual controls, ZenFone 4 Pro's camera has an assortment of fun, creative modes to enhance your photography experience and let you easily achieve professional-looking results.

ZenFone 4 Pro (ZS551KL)
2x Optical-Zoom Camera
A camera that brings you closer

ZenFone 4 Pro's 2x optical-zoom 16MP camera with a Sony IMX351 image sensor and ultrafast, phase detection auto-focus adds an entirely new viewpoint to your mobile photography. Its 50mm focal length brings distant subjects closer, putting them in sharp focus while softening background details. Combined with the ability to switch instantly between main camera 25mm focal length and all-new Portrait mode that uses both lenses simultaneously to make your subjects stand out, ZenFone 4 Pro's camera lets you capture gorgeous portraits and close-ups with a sense of depth for professional-looking photos that rival those from DSLR cameras.

ZenFone 4 Pro (ZS551KL)ZenFone 4 Pro (ZS551KL)
Selfie Camera
Beautiful selfies, day or night

ZenFone 4 Pro has the world's most advanced dual smartphone cameras and it's also a selfie superstar. The front-facing camera features fast, phase-detection auto-focus, the Sony IMX319 image sensor with F1.9 aperture, 1.4µm pixel size, and ASUS SuperPixel™ Engine that boosts 2x* light sensitivity while reducing image noise, letting you capture beautifully clear and vivid selfies, day or night, indoors or out. Together with SelfieMaster technology that offers beautification effects, Selfie Panorama, and more, you'll capture more glamorous selfies than ever before and have more fun shooting group selfies with your friends. When shooting selfie videos, electronic image stabilization (EIS) eliminates annoying shakes for silky smooth results.

* Compared to typical smartphone camera with 16MP resolution, F2.0 aperture and 1µm pixel size.

ZenFone 4 Pro (ZS551KL)
Efficiently powerful, effortlessly fast

ZenFone 4 Pro is built upon the latest Qualcomm® Snapdragon™ 835 Mobile Platform to deliver powerful performance and a responsive camera experience, while a Qualcomm Adreno™ 540 graphics provide the best performance for high-end mobile gaming. ZenFone 4 Pro supports blazingly fast Cat 12 LTE Advanced networking with 3-channel carrier aggregation for download speeds of up to 600Mbps. It also supports dual-band 802.11ac Wi-Fi in a 2x2 MIMO configuration for ultrafast and reliable wireless connectivity. A built-in portable Wi-Fi hotspot lets you share connectivity with other mobile devices. Built-in NFC enables convenient mobile payments with Android Pay, and a front-mounted Live fingerprint reader offers improved security and fast phone unlocking in just 0.3 seconds.

ZenFone 4 Pro (ZS551KL)ZenFone 4 Pro (ZS551KL)
Gaming made easy

ZenFone 4 Pro is powered by the flagship 64-bit Qualcomm® Snapdragon™ 835 octa-core processor that offers tremendous performance with eight CPU cores, up to a 2.45GHz clock speed and up to 6GB RAM. Second-generation, 10nm Fin Field Effect Transistors (FinFETs) deliver 20 percent improved performance, while reducing power consumption by 25 percent compared to the previous-generation Snapdragon 820 processor. Together with desktop-grade Adreno™ graphics, ZenFone 4 Pro handles even the most demanding apps and games with ease.

ZenFone 4 Pro (ZS551KL)
Powerful Network
Ultrafast network connectivity

ZenFone 4 Pro delivers ultrafast connectivity with Cat 12 LTE Advanced cellular networking and dual-band 802.11ac Wi-Fi in a 2x2 MIMO configuration for download speeds of up to 866Mbps. You can also turn ZenFone 4 Pro into a portable Wi-Fi hotspot and share connectivity with other mobile devices.

ZenFone 4 Pro (ZS551KL)ZenFone 4 Pro (ZS551KL)
Battery & BoostMaster™
Charge faster, work and play longer

When creating ZenFone 4 Pro, ASUS engineers combined the fantastic energy-efficiency of the Qualcomm® Snapdragon™ 835 processor with a high-capacity 3600mAh lithium polymer battery, resulting in a smartphone that delivers an amazing battery life of up to 2 weeks of 4G standby time. When it's time to recharge, ASUS BoostMaster technology provides 18W (9V/2A) of power for incredibly fast charging. With ZenFone 4 Pro's supplied adapter, just a five-minute charge provides two hours of talk time, and built-in safeguards protect against overcharging.

Timeless Zen design, simplicity

ZenFone 4 Pro evolves the prestigious ZenFone design lineage with numerous refinements that give it a singular beauty and provide an unparalleled user experience. Crafted with a solid aluminum unibody using advanced Nano Molding Technology (NMT), ZenFone 4 Pro is thin and light, yet incredibly strong. An expansive 5.5-inch display is surrounded by an ultra-narrow bezel, providing a cinematic view and a slimmer width for easy one-handed operation. ZenFone 4 Pro's dual camera system is integrated completely within the phone chassis for a perfectly flat rear surface with no protrusions. Both the front and rear of the ZenFone 4 Pro are encased in 2.5D curved Corning® Gorilla® Glass that provides a more comfortable grip and a durable, scratch-resistant finish. A fine, diamond-cut metal edge provides a luxurious accent. ZenFone 4 Pro is available in two luxurious colors: Moonlight White and Pure Black.

ZenFone 4 Pro (ZS551KL)ZenFone 4 Pro (ZS551KL)
Sensational display with auto color tuning

With a bright 500-nit AMOLED display, Full HD (1920 x 1080) resolution, and a color gamut that's greater than 100 percent of NTSC color space, ZenFone 4 Pro makes photos, videos, and all your other content look as vibrant as real life. An ambient light sensor with ASUS Splendid technology adjusts the color temperature of the display based on environmental lighting, resulting in a natural and comfortable viewing experience.

ZenFone 4 Pro (ZS551KL)
SonicMaster 4.0
Unrivalled smartphone audio

ZenFone 4 Pro has supreme audio performance for entertainment and phone calls. It is equipped with dual speakers driven by a powerful NXP Smart AMP that deliver expansive, stereo sound with minimal distortion, even at high volumes. The two speakers project sound in different directions to create immersive listening experiences for all of your multimedia content. Hi-Res Audio certification enables 24-bit/192kHz — 4x CD quality — audio playback. The all-new AudioWizard app has custom Listening Profile mode, which automatically adapts the sound profile to your preference, providing the best audio experience for you, and DTS Headphone:X™ provides theater-quality 7.1-channel virtual surround sound over headphones.

ZenFone 4 Pro (ZS551KL)
ZenUI 4.0
Simpler. Faster. Smarter.

Simpler, faster and even smarter than ever, ASUS ZenUI 4.0 features a new visual design and keeps only the essential apps. It works faster thanks to quicker response across the board too. Smart new, automated ZenUI features make life easier including: auto face tagging in Gallery, Safeguard that automates communications in emergencies, Page Marker which helps you bookmark web pages and more.

ZenFone 4 Pro (ZS551KL)

Warranty & Returns

Warranty, Returns, And Additional Information


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
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