Asus Zenfone 4 Pro ZS551KL vs Nokia E66: specs comparison

Key differences

Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

Weight

E66: 54 g lighter

Zenfone 4 Pro ZS551KL:

175 g

E66:

121 g
Width

E66: 26.1 mm narrower

Zenfone 4 Pro ZS551KL:

75.6 mm

E66:

49.5 mm
Screen diagonal

E66: 3.1 in smaller diagonal

Zenfone 4 Pro ZS551KL:

5.5 in

E66:

2.4 in
Rear camera layout

Zenfone 4 Pro ZS551KL:

Dual

E66:

Single
Depth

Zenfone 4 Pro ZS551KL: 6 mm thinner

Zenfone 4 Pro ZS551KL:

7.6 mm

E66:

13.6 mm
Height

E66: 49.4 mm shorter

Zenfone 4 Pro ZS551KL:

156.9 mm

E66:

107.5 mm

Physical size

Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

1. Zenfone 4 Pro ZS551KL

Height:

156.9 mm +49.4 mm versus E66
Width:

75.6 mm +26.1 mm versus E66
Depth:

7.6 mm
2. E66

Height:

107.5 mm
Width:

49.5 mm
Depth:

13.6 mm +6 mm versus Zenfone 4 Pro ZS551KL

Weight

Bars start at zero and share a scale within this chart.

1. Zenfone 4 Pro ZS551KL

175 g

+54 g versus E66
2. E66

121 g

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

1. Zenfone 4 Pro ZS551KL

Screen diagonal:

5.5 in

Aspect ratio (height:width):

16:9

Approximate rectangular screen area:

83.4 cm²
2. E66

Screen diagonal:

2.4 in

Aspect ratio (height:width):

4:3

Approximate rectangular screen area:

17.8 cm²

Zenfone 4 Pro ZS551KL has approximately 367.5% more rectangular screen area than E66.

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

Recorded RAM for Zenfone 4 Pro ZS551KL, E66, compared at the same storage capacity.
Storage	Zenfone 4 Pro ZS551KL	E66
64 GB	6 GB RAM	Unknown
128 GB	6 GB RAM	Unknown

E66: Original memory entry

110 MB · 128 MB RAM

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

1. Zenfone 4 Pro ZS551KL

NFC:: Yes
Headphone jack:: Yes
Memory card support:: See details microSD · up to 512 GB (uses SIM 2 slot)

2. E66

NFC:: Unknown
Headphone jack:: No
Memory card support:: See details microSD · up to 8 GB (dedicated slot)

Battery capacity

Capacity is not battery life. No endurance test is implied.

Recorded battery capacity

Bars start at zero and share a scale within this chart.

1. Zenfone 4 Pro ZS551KL

3600 mAh

+2600 mAh versus E66
2. E66

1000 mAh

Specifications

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.

1. Zenfone 4 Pro ZS551KL2. E66

Everyday essentials

Everyday essentials — specifications for Zenfone 4 Pro ZS551KL, E66.
Specification	Zenfone 4 Pro ZS551KL	E66
Dimensions (HxWxD)	156.9 Х 75.6 Х 7.6 mm	107.5 Х 49.5 Х 13.6 mm
Weight	175 g	121 g
Technology	AMOLED	TFT
Screen size	5.5" inch	2.4" inch
Screen resolution	1080 x 1920 px	240 x 320 px
Internal memory Recorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.	64/128 GB 6 GB RAM	110 MB 128 MB RAM
Memory card support	microSD up to 512 GB (uses SIM 2 slot)	microSD up to 8 GB (dedicated slot)
Battery Capacity is not battery life. No endurance test is implied.	3600 mAh Non-removable Li-Ion	1000 mAh Removable Li-Ion
Operating system OS	Android 7.1.1 (Nougat) upgradable to Android 8 (Oreo); ZenUI 4	Symbian OS 9.2 Series 60 v3.1 UI
Chipset	Qualcomm MSM8998 Snapdragon 835 (10 nm)	Unknown
NFC	Yes	Unknown
Headphone jack	Yes	No

Display

Display — specifications for Zenfone 4 Pro ZS551KL, E66.
Specification	Zenfone 4 Pro ZS551KL	E66
Touchscreen	capacitive touchscreen	Unknown
Display colors	16M	16M
Screen area	83.4 cm2	17.8 cm2
Screen format	16:9 (height:width)	4:3 (height:width)
Screen to body ratio	70.3%	33.5%
PPI /points per inch/	401 PPI	167 PPI
Screen protection	Corning Gorilla Glass 5	Unknown

Camera and Video

Camera and Video — specifications for Zenfone 4 Pro ZS551KL, E66.
Specification	Zenfone 4 Pro ZS551KL	E66
Rear camera, main	12 MP Dual	3.15 MP Single
Camera specs	12 MP f/1.7 25mm (wide) 1/2.55'' 1.4µm 4-axis OIS dual pixel PDAF & laser AF -16 MP 50mm (telephoto) 1/3.1'' 1.0µm 2x optical zoom AF	3.15 MP AF
Functions	HDR	LED flash
Video	1080p@30fps	320p@15fps
Front camera, selfie	8 MP Single	0.3 MP Single
Specifications	8 MP f/1.9 1/3.2'' 22mm (wide) 1.4µm PDAF	Videocall camera

Performance

Performance — specifications for Zenfone 4 Pro ZS551KL, E66.
Specification	Zenfone 4 Pro ZS551KL	E66
Processor CPU	Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)	369 MHz ARM 11
Graphics processor GPU	Adreno 540	Unknown

General specs

General specs — specifications for Zenfone 4 Pro ZS551KL, E66.
Specification	Zenfone 4 Pro ZS551KL	E66
Release date	2017 August	2008 June
Colors	Moonlight White Pure Black	White Steel Grey Steel Black Red
Historical recorded price Legacy catalogue value; date unknown. Not a current offer.	390 EUR	180 EUR
Battery life	Talking time- Up to 27 h 30 min (3G)	Stand by time- Up to 264 h (2G) / 336 h (3G) Talking time- Up to 7 h 30 m (2G) / 7 h 30 min (3G)
Body build	Front/back glass (Gorilla Glass 5) & aluminum frame	Unknown

Communication and Connectivity

Communication and Connectivity — specifications for Zenfone 4 Pro ZS551KL, E66.
Specification	Zenfone 4 Pro ZS551KL	E66
SIM card	Hybrid Dual SIM (Nano-SIM dual stand-by)	Mini-SIM
Network	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 -3G - HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100 -4G - LTE band 1(2100) 2(1900) 3(1800) 4(1700/2100) 5(850) 7(2600) 8(900) 17(700) 19(800) 20(800) 28(700) 38(2600) 39(1900) 40(2300) 41(2500) - Global Taiwan LTE band 1(2100) 12(700) 18(800) 26(850) 29(700) 30(2300) 41(2500) - US Canada Brazil LTE band 1(2100) 41(2500) - India	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900
Speed	HSPA 42.2/5.76 Mbps LTE-A (3CA) Cat12 600/150 or 100 Mbps	HSPA 3.6/0.384 Mbps
GPRS	Yes	Class 32 100 kbps
Edge	Yes	Class 32 296 kbps
Wi-Fi	Wi-Fi 802.11 a/b/g/n/ac dual-band WiFi Direct hotspot	Wi-Fi 802.11 b/g
GPS	Yes with A-GPS GLONASS BDS GALILEO	Yes with A-GPS; Nokia Maps
USB	Type-C 1.0 reversible connector	microUSB 2.0
Bluetooth	5.0 A2DP EDR LE aptX	2.0 A2DP
Harmful irradiation	Unknown	SAR - 1.01 W/kg (head) 0.36 W/kg (body) SAR EU - 1.20 W/kg (head)

Music and Audio

Music and Audio — specifications for Zenfone 4 Pro ZS551KL, E66.
Specification	Zenfone 4 Pro ZS551KL	E66
Radio	FM radio	FM radio
Others	24-bit/192kHz audio -DTS sound -Active noise cancellation with dedicated mic	2.5 mm audio jack

Other features

Other features — specifications for Zenfone 4 Pro ZS551KL, E66.
Specification	Zenfone 4 Pro ZS551KL	E66
Dop	Sensors Fingerprint (front-mounted) accelerometer gyro proximity compass color spectrum Infrared port - Fast battery charging: 50% in 32 min	Sensors Accelerometer Infrared port - MP3/AAC/MP4 player -Document viewer (Word Excel PowerPoint PDF) incl. MS Office 2007 support via free update -Push to talk -Voice command/dial -Turn-to-mute -Organizer -VoIP -Printing

Asus Zenfone 4 Pro ZS551KL vs Nokia E66