Asus Zenfone 4 Pro ZS551KL
$250
Overview
Asus Zenfone 4 Pro ZS551KL is a mid-range Android smartphone released in 2017 with a 5.5-inch AMOLED, Snapdragon 835 chipset, 12 main camera, and 3600 mAh battery.
The device runs ROG UI with features like AirTriggers. Priced at $250, it targets users seeking mid-range performance.
Specifications of Asus Zenfone 4 Pro ZS551KL
The display of Asus Zenfone 4 Pro ZS551KL measures 5.5 inches with AMOLED technology. Peak brightness reaches 600 nits for excellent outdoor visibility. The screen renders at 1080x1920 pixels resolution.
The camera system of Asus Zenfone 4 Pro ZS551KL features 2 rear cameras: 12 main, 16MP telephoto. Video recording supports up to 2160p.
The battery of Asus Zenfone 4 Pro ZS551KL has 3600mAh capacity with 18 wired charging. A full charge takes approximately 120 min minutes.
The performance of Asus Zenfone 4 Pro ZS551KL is powered by the Snapdragon 835 chipset with Adreno 540 GPU. Geekbench scores reach 1900 single-core and 6500 multi-core. AnTuTu benchmark achieves 200000.
The memory of Asus Zenfone 4 Pro ZS551KL offers 6GB RAM with 64GB storage options. RAM uses LPDDR4X technology. Storage is 64GB 6GB RAM, 128GB 6GB RAM.
The connectivity of Asus Zenfone 4 Pro ZS551KL includes Wi-Fi Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, and Bluetooth 5.0. NFC is supported for contactless payments.
The build of Asus Zenfone 4 Pro ZS551KL weighs 175.0g with Aluminum frame and Glass back. Dimensions measure 156.9 x 75.6 x 7.6 mm.
The software of Asus Zenfone 4 Pro ZS551KL runs Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4 with ZenUI. Software support extends 2 years through 2028.
Compare Asus Zenfone 4 Pro ZS551KL
Frequently Asked Questions about Asus Zenfone 4 Pro ZS551KL
Asus Zenfone 4 Pro ZS551KL has a 12 camera suitable for casual photography. For professional photography, consider phones with higher-resolution sensors.
Yes, Asus Zenfone 4 Pro ZS551KL is excellent for gaming with its Snapdragon 835 chipset. It handles demanding games at high settings with smooth frame rates.
Asus Zenfone 4 Pro ZS551KL receives 2 years of updates through 2028. Consider this when planning long-term device usage.
Asus Zenfone 4 Pro ZS551KL has a 3600mAh battery. Battery life varies based on usage patterns.
Asus Zenfone 4 Pro ZS551KL at $250 is a mid-range device offering Snapdragon 835. It's worth buying if you prioritize balanced performance and value.
Asus Zenfone 4 Pro ZS551KL supports 18 wired charging with full charge in approximately 120 min minutes.
Asus Zenfone 4 Pro ZS551KL is available in 64GB storage options. Storage is not expandable, so choose your capacity based on your needs.
Asus Zenfone 4 Pro ZS551KL has a 5.5-inch AMOLED with 60Hz refresh rate and 600 nits peak brightness.
Asus Zenfone 4 Pro ZS551KL in Category Rankings
See how Asus Zenfone 4 Pro ZS551KL ranks in these categories:
Verdict
The Asus Zenfone 4 Pro ZS551KL delivers solid value for budget-conscious users who need reliable performance. Select this phone for reliable daily use, if you seek good value without compromising on essential features.
Key Specifications
Display
5.5"
Main Camera
12
Chipset
Snapdragon 835
Full Specifications
Network
| Technology | GSM / HSPA / LTE |
| 2G Bands | GSM / |
| 3G Bands | HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100 |
| 4G LTE Bands | LTE |
| 5G Sub-6 Bands | N/A |
| 5G mmWave Bands | N/A |
| Speed | N/A |
| Carrier Aggregation | 4x4 MIMO |
| SIM | Nano-SIM |
| Dual SIM Mode | Dual SIM |
| eSIM Support | |
| VoLTE Support | N/A |
| VoWiFi | N/A |
| NR CA Support | N/A |
Launch
| Announced | 2017 |
| Status | Discontinued |
| Availability | N/A |
| Model Variants | N/A |
| Launch Price | $600 |
Body & Design
| Dimensions (mm) | 156.9 x 75.6 x 7.6 mm |
| Weight (g) | 175.0 |
| Build Materials | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame |
| Frame | Aluminum |
| Back Finish | Glass |
| Colors | ["Moonlight white", "Pure Black"] |
| IP Rating | N/A |
| Rugged Certifications | N/A |
| Ingress Gaskets | N/A |
| Form Factor | Bar |
| Hinge Type | N/A |
| Folded Dimensions | N/A |
| Thermal Solution | Passive |
| Notification/Alert | |
| Haptics | Basic |
Display
| Panel Type | AMOLED |
| Size (inches) | 5.5 |
| Resolution (px) | 1080x1920 pixels |
| Aspect Ratio | 9:16 |
| Pixel Density (ppi) | 401 |
| Screen-to-body Ratio (%) | 70.3 |
| Refresh Rate (Hz) | 60 |
| Adaptive Refresh Rate | |
| Touch Sampling Rate (Hz) | 120 |
| Peak Brightness (nits) | 600 |
| HDR Standards | N/A |
| Color Gamut | sRGB |
| Color Depth | 24 |
| PWM Dimming (Hz) | 240 |
| Glass Protection | Corning Gorilla Glass 5 |
| Oleophobic Coating | N/A |
| Curvature | Flat |
| Always-on Display | |
| Display Driver IC | N/A |
| Cover Display | N/A |
Platform (SoC)
| OS at Launch | Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4 |
| Update Policy | 2 years |
| Chipset | Snapdragon 835 |
| CPU | Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo) |
| GPU | Adreno 540 |
| NPU/AI TOPs | N/A |
| ISP Features | Dual Pixel PDAF |
| Modem | Snapdragon X16 |
| Wi-Fi/Bluetooth Chip | N/A |
| Throttling Behavior | N/A |
| Geekbench Single-Core | 1900 |
| Geekbench Multi-Core | 6500 |
| AnTuTu Score | 200000 |
| 3DMark Scores | N/A |
Memory & Storage
| RAM | 6GB |
| RAM Type | LPDDR4X |
| Storage | 64GB |
| Storage Type | 64GB 6GB RAM, 128GB 6GB RAM |
| Storage Speed | UFS 2.1 |
| Expandable Storage | microSDXC (uses shared SIM slot) |
| Slot Type | microSD |
| USB OTG | |
| Filesystem Encryption | FIPS 140-2 |
Main Camera System
| Rear Cameras | 2 |
| Main Sensor | 12 |
| Main Sensor Size | 1/2.55" |
| Main Sensor Model | Sony IMX362 |
| Main Lens | f/1.7, 25mm |
| OIS | |
| Autofocus | PDAF |
| Pixel Binning | |
| Ultrawide | N/A |
| Telephoto | 16MP |
| Macro | N/A |
| Depth/ToF/LiDAR | |
| Flicker/Color Sensors | N/A |
| Flash | Dual-LED |
| Video Resolution | 2160p |
| HDR/Dolby Vision Video | |
| Video Codecs | H.264, H.265 |
| Slow Motion | 720p@120fps |
| Video Stabilization | EIS |
| Night Mode Features | |
| RAW/Pro Controls | N/A |
Selfie Camera
| Resolution | 8 |
| Sensor Size | 1/3.06 |
| Aperture | f/1.9 |
| AF/OIS | |
| Secondary Front Cam | |
| Front Flash | |
| Video | 1080p@30fps |
| HDR/Dolby Vision | N/A |
| Face Unlock | 2D |
Audio
| Loudspeakers | Yes, dual speakers |
| 3.5mm Jack | |
| Hi-Res Audio | 24-bit/192kHz |
| Spatial Audio / Dolby Atmos | N/A |
| Microphones | 2 |
| Bluetooth Codecs | aptX, aptX HD, LDAC |
| DAC/Amp | ESS Sabre 9018C2M |
Connectivity
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct |
| Wi-Fi Features | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct |
| Bluetooth | 5.0 |
| NFC | |
| IR Blaster | |
| UWB | N/A |
| Positioning | GPS, GLONASS, BDS, GALILEO |
| Dual-Band GNSS | |
| FM Radio | |
| USB | USB Type-C 2.0 |
| Display Out | |
| eSIM Capacity |
Sensors
| Fingerprint Sensor | Fingerprint (Front-Mounted) |
| 3D Face ID | N/A |
| Accelerometer | |
| Gyroscope | |
| Magnetometer | |
| Proximity Sensor | |
| Ambient Light | |
| Barometer | |
| Thermo/Hygrometer | N/A |
| UV Sensor | N/A |
| Hall Sensor | |
| Color Temp Sensor | N/A |
| Health Sensors | N/A |
| Satellite SOS |
Battery & Charging
| Capacity (mAh) | 3600 |
| Type | Li-Ion |
| Removable | |
| Endurance Rating | N/A |
| Wired Charging | 18 |
| Wired Standard | Quick Charge 4.0 |
| 0-50% Time (mins) | 32 min |
| Full Charge Time | 120 min |
| Wireless Charging | N/A |
| Wireless Standard | N/A |
| Reverse Wireless | N/A |
| Reverse Wired | |
| Charger in Box | 18W |
| Battery Health Features | Adaptive Charging |
Software
| OS at Launch | Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4 |
| Update Window | 2 years |
| UI Skin / Launcher | ZenUI |
| Feature Drops | N/A |
| App Cloning | N/A |
| Game Mode | |
| Privacy Features | app locker |
| Accessibility | color inversion, magnification |
| Satellite Messaging UI |
Miscellaneous
| In-Box Contents | phone, charger, cable, case, earphones |
| Recycled Materials (%) | N/A |
| Repairability Score | N/A |
| Warranty | N/A |
Reviews & Ratings
186 ratings
Showing 3 of 186 reviews
Alex R.
2 weeks ago
Absolutely love the camera on this phone! The zoom is incredible and the photos are so crisp. Battery life is also a huge plus.
Ben C.
1 month ago
Great performance and beautiful display. My only complaint is that it feels a bit heavy, but you get used to it. Solid phone overall.
Chloe D.
3 months ago
The best phone I've ever owned. It's fast, the software is clean, and the build quality is top-notch. Highly recommend!
Asus Zenfone 4 Pro ZS551KL Review: Solid Performance for the Price
Our comprehensive review of the Asus Zenfone 4 Pro ZS551KL covers display quality, camera performance, battery life, and overall value. A solid choice in its price segment.
- + Powerful Snapdragon 835 chipset for smooth performance
- - Camera performance is average
- - Battery life could be better