Battery
TechnologyLithium polymer
Capacity3600 mAh
Fast Charging TechnologyBoostMaster Fast Charging
Standby Time336 hours
Run Time DetailsStandby: up to 336 hrs Continuous browsing (Wi-Fi): up to 17 hrs
Cellular
TechnologyWCDMA (UMTS) / GSM
Mobile Broadband Generation4G
Service ProviderNot specified
Operating SystemAndroid 7.0 Nougat
User InterfaceASUS ZenUI 4.0
NavigationGPS, A-GPS, GLONASS, BeiDou
SIM Card TypeNano SIM
SIM Card Slot QtyDual-SIM
Input DeviceMulti-touch, capacitive
Communications
Data TransmissionGPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE, VoLTE, FDD-LTE, TDD-LTE
2G BandGSM 850/900/1800/1900
3G UMTS BandBand 1, Band 2, Band 4, Band 5, Band 6, Band 8, Band 19
3G UMTS Frequency2100, 1900, 1700, 850, 800, 900, 800
4G LTE BandBand 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 17, Band 18, Band 19, Band 20, Band 26, Band 28, Band 29, Band 38, Band 39, Band 41
4G LTE FrequencyFDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 850+, FDD 700 APT, FDD 700d, TDD 2600, TDD 1900, TDD 2500
Wireless InterfaceNFC, IEEE 802.11a/b/g/n/ac, Bluetooth 5.0
Connections
Connector TypeHeadphones - mini-phone 3.5 mm USB Type-C - 24 pin USB-C
Display
TypeOLED display
TechnologyAMOLED
Diagonal Size5.5"
Display Resolution1920 x 1080 pixels
Display FormatFull HD
Max Brightness500 cd/m²
ProtectionCorning Gorilla Glass (scratch resistant glass)
FeaturesASUS Tru2Life, Bluelight Filter for Eye Care, 2.5D Glass
Front Camera
Sensor Resolution8 Megapixel
Sensor NameSony Exmor RX IMX319 sensor
Lens ApertureF/1.9
Special EffectsMiniature, HDR, Depth of field
FeaturesElectronic Image Stabilizer (EIS), PixelMaster 4 camera, Phase Detect Auto-Focus (PDAF), Time Rewind, Smart Remove, ASUS SelfieMaster technology, 3-axis electronic image stabilization
Lens TypeWide-angle lens
Camera ModesPanorama, Time-lapse mode, Slow motion mode, night mode, selfie mode, manual mode, super resolution mode, low-light shots, All Smiles mode, Photo Effect Mode, panoramic selfies, selfie panorama, GIF animation function, Real-Time Beautification
General
Product TypeSmartphone
Form FactorTouch
Integrated ComponentsFront-facing camera, FM radio, audio player, voice recorder, navigation, dual rear-facing camera
Width3 in
Depth0.3 in
Height6.2 in
Weight6.07 oz
Body ColorBlack
Body MaterialAluminum
Graphics System
Graphics AcceleratorQualcomm ADRENO 540
Manufacturer Warranty
Service & SupportLimited warranty - 1 year
Media Player
Sound EnhancementsVirtual Surround Sound, DTS Headphone:X 7.1, Hi-Res audio
Memory
RAM6 GB
Internal Memory Capacity64 GB
Supported Flash Memory CardsmicroSDXC - up to 2 TB
Messaging & Internet
Messaging ServicesSMS, MMS
Supported Social Networks and BlogsYes
Miscellaneous
Included AccessoriesPower adapter, SIM card removal tool, ASUS ZenEar with Mic, micro-USB to USB cable, bumper
Phone Features
Phone FunctionsSpeakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert
SensorsAccelerometer, ambient light sensor, proximity sensor, gyro sensor, RGB sensor
Security DevicesFingerprint reader
Additional FeaturesMIMO technology, Wi-Fi Calling, Google Drive Storage (100 GB) (free for 2 years), ASUS Splendid, Three microphones with noise-cancellation, ASUS SonicMaster 4.0 technology
Processor
TypeQualcomm Snapdragon 835
Processor NumberMSM8998
Clock Speed2.45 GHz
Processor Core Qty8-core
64-bit ArchitectureYes
Rear Camera
Sensor Resolution12 Megapixel
Sensor TypeRGB CMOS
Sensor NameSony Exmor RS IMX362 sensor
Optical Image Stabilizer4 Stop OIS (Optical Image Stabilization)
Lens Construction6-element
Min Focal Length25 mm
Focus AdjustmentAutomatic
Laser Auto FocusYes
Digital Zoom10
Light SourceDual LED flash
Video Resolutions3840 x 2160 (4K) at 30 fps
FeaturesDual Pixel technology, Electronic Image Stabilizer (EIS), 3-axis electronic image stabilization, Dual Phase Detect Auto-Focus (PDAF), RAW image capture, ASUS SuperPixel technology, Subject-Tracking Auto-Focus, 4-axis optical image stabilization
Lens ApertureF/1.7
Second Rear Camera
Sensor Resolution16 Megapixel
Sensor NameSony Exmor RS IMX351 sensor
Universal Product Identifiers
BrandASUS
Part Numbers889349825853, ZS551KL, ZS551KL-PRO6064, ZS551KL-S835-6G64G-BK
GTIN00889349825853
