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Asus Zenfone 4 Pro ZS551KL
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Phone Insight
Full Specifications October 20, 2026
Asus Zenfone 4 Pro ZS551KL Android 7.0
Asus · 2017

Asus Zenfone 4 Pro ZS551KL

Asus Zenfone 4 Pro ZS551KL Android smartphone. Announced Aug 2017. Features 5.5″ display, Snapdragon 835 chipset, Dual: 12 MP (f/1.7, 25mm, 1/2.55″, 1.4µm, 4-axis OIS, dual pixel PDAF) + 16 MP primary camera, 8 MP front camera, 3600 mAh battery, 128 GB storage, 6 GB RAM, Corning Gorilla Glass 5.

Display 5.5"
Chipset Snapdragon 835
RAM 6 GB
Storage 64GB/128GB storage, microSDXC
Camera 16 MP
Battery 3600 mAh
OS Android 7.1.1, up to Android 8, ZenUI 4
Build 175g, 7.6mm thickness

Launch

Announced 2017, August. Released 2017, October
Status Discontinued

Platform

OS Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4
Chipset Qualcomm MSM8998 Snapdragon 835 (10 nm)
CPU Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)
GPU Adreno 540

Display

Type AMOLED
Size 5.5 inches, 83.4 cm 2 (~70.3% screen-to-body ratio)
Resolution 1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
Protection Corning Gorilla Glass 5

Memory

Card slot microSDXC (uses shared SIM slot)
Internal 64GB 6GB RAM, 128GB 6GB RAM

Main Camera

Dual 12 MP, f/1.7, 25mm (wide), 1/2.55", 1.4µm, dual pixel PDAF, 4-axis OIS 16 MP, 50mm (telephoto), 1/3.1", 1.0µm, AF, 2x optical zoom
Features Laser AF, color spectrum sensor, LED flash, HDR, panorama
Video 4K@30fps, 1080p@30/60fps, 1080p@120fps, 720p@240fps

Selfie camera

Single 8 MP, f/1.9, 22mm (wide), 1/3.2", 1.4µm, PDAF
Features HDR
Video 1080p@30fps

Body

Dimensions 156.9 x 75.6 x 7.6 mm (6.18 x 2.98 x 0.30 in)
Weight 175 g (6.17 oz)
Build Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
SIM Nano-SIM + Nano-SIM

Battery

Type Li-Ion 3600 mAh, non-removable
Charging 18W wired, 50% in 32 min
Talk time Up to 27 h 30 min (3G)

Sound

Loudspeaker Yes, dual speakers
3.5mm jack Yes
optionalother 24-bit/192kHz audio

Comms

WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth 5.0, A2DP, EDR, LE, aptX
Positioning GPS, GLONASS, BDS, GALILEO
NFC Yes
Infrared port Yes
Radio FM radio
USB USB Type-C 2.0, OTG

Network

Technology GSM / HSPA / LTE
2G bands GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100
4G bands 1, 2, 3, 4, 5, 7, 8, 17, 19, 20, 28, 38, 39, 40, 41 - Global, Taiwan
Speed HSPA 42.2/5.76 Mbps, LTE (3CA) Cat12 600/150 or 100 Mbps

Features

Sensors Fingerprint (front-mounted), accelerometer, gyro, proximity, compass

Misc

Colors Moonlight white, Pure Black
Models Z01GD, Z01GS
Phone Insight phoneinsight.org/ Printed October 20, 2026

For live pricing, photos, and comparisons, visit phoneinsight.org/phones/asus-zenfone-4-pro-zs551kl/

In depth

Full specifications

Announced 2017, August. Released 2017, October
Status Discontinued
OS Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4
Chipset Qualcomm MSM8998 Snapdragon 835 (10 nm)
CPU Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)
GPU Adreno 540
Type AMOLED
Size 5.5 inches, 83.4 cm 2 (~70.3% screen-to-body ratio)
Resolution 1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
Protection Corning Gorilla Glass 5
Card slot microSDXC (uses shared SIM slot)
Internal 64GB 6GB RAM, 128GB 6GB RAM
Dual 12 MP, f/1.7, 25mm (wide), 1/2.55", 1.4µm, dual pixel PDAF, 4-axis OIS 16 MP, 50mm (telephoto), 1/3.1", 1.0µm, AF, 2x optical zoom
Features Laser AF, color spectrum sensor, LED flash, HDR, panorama
Video 4K@30fps, 1080p@30/60fps, 1080p@120fps, 720p@240fps
Single 8 MP, f/1.9, 22mm (wide), 1/3.2", 1.4µm, PDAF
Features HDR
Video 1080p@30fps
Dimensions 156.9 x 75.6 x 7.6 mm (6.18 x 2.98 x 0.30 in)
Weight 175 g (6.17 oz)
Build Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
SIM Nano-SIM + Nano-SIM
Type Li-Ion 3600 mAh, non-removable
Charging 18W wired, 50% in 32 min
Talk time Up to 27 h 30 min (3G)
Loudspeaker Yes, dual speakers
3.5mm jack Yes
optionalother 24-bit/192kHz audio
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth 5.0, A2DP, EDR, LE, aptX
Positioning GPS, GLONASS, BDS, GALILEO
NFC Yes
Infrared port Yes
Radio FM radio
USB USB Type-C 2.0, OTG
Technology GSM / HSPA / LTE
2G bands GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100
4G bands 1, 2, 3, 4, 5, 7, 8, 17, 19, 20, 28, 38, 39, 40, 41 - Global, Taiwan
Speed HSPA 42.2/5.76 Mbps, LTE (3CA) Cat12 600/150 or 100 Mbps
Sensors Fingerprint (front-mounted), accelerometer, gyro, proximity, compass
Colors Moonlight white, Pure Black
Models Z01GD, Z01GS
Price About 350 EUR
PhoneInsight Benchmark
52.8/100
Mid-range

A specs-derived composite score, not a lab benchmark -- useful for ranking and comparison.

Processor 46.8
Display 67.8
Camera 72.3
Battery 60.2
0.1%Popularity rank
1,637,132 hitsTotal views
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