Asus Zenfone 4 Pro ZS551KL vs Celkon A64: 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

A64: 49.4 g lighter

Zenfone 4 Pro ZS551KL:

175 g

A64:

125.6 g
Width

A64: 10.6 mm narrower

Zenfone 4 Pro ZS551KL:

75.6 mm

A64:

65 mm
Screen diagonal

A64: 1.5 in smaller diagonal

Zenfone 4 Pro ZS551KL:

5.5 in

A64:

4 in
Rear camera layout

Zenfone 4 Pro ZS551KL:

Dual

A64:

Single
Depth

Zenfone 4 Pro ZS551KL: 2.9 mm thinner

Zenfone 4 Pro ZS551KL:

7.6 mm

A64:

10.5 mm
Height

A64: 32.9 mm shorter

Zenfone 4 Pro ZS551KL:

156.9 mm

A64:

124 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 +32.9 mm versus A64
Width:

75.6 mm +10.6 mm versus A64
Depth:

7.6 mm
2. A64

Height:

124 mm
Width:

65 mm
Depth:

10.5 mm +2.9 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

+49.4 g versus A64
2. A64

125.6 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. A64

Screen diagonal:

4 in

Aspect ratio (height:width):

3:2

Approximate rectangular screen area:

47.6 cm²

Zenfone 4 Pro ZS551KL has approximately 75% more rectangular screen area than A64.

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, A64, compared at the same storage capacity.
Storage	Zenfone 4 Pro ZS551KL	A64
64 GB	6 GB RAM	Unknown
128 GB	6 GB RAM	Unknown

A64: Original memory entry

512 MB · 256 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. A64

NFC:: Unknown
Headphone jack:: Yes
Memory card support:: See details microSD · up to 32 GB

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

+2200 mAh versus A64
2. A64

1400 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. A64

Everyday essentials

Everyday essentials — specifications for Zenfone 4 Pro ZS551KL, A64.
Specification	Zenfone 4 Pro ZS551KL	A64
Dimensions (HxWxD)	156.9 Х 75.6 Х 7.6 mm	124 Х 65 Х 10.5 mm
Weight	175 g	125.6 g
Technology	AMOLED	TFT
Screen size	5.5" inch	4" inch
Screen resolution	1080 x 1920 px	320 x 480 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	512 MB 256 MB RAM
Memory card support	microSD up to 512 GB (uses SIM 2 slot)	microSD up to 32 GB
Battery Capacity is not battery life. No endurance test is implied.	3600 mAh Non-removable Li-Ion	1400 mAh Li-Ion
Operating system OS	Android 7.1.1 (Nougat) upgradable to Android 8 (Oreo); ZenUI 4	Android 4.2.2 (Jelly Bean)
Chipset	Qualcomm MSM8998 Snapdragon 835 (10 nm)	Unknown
NFC	Yes	Unknown
Headphone jack	Yes	Yes

Display

Display — specifications for Zenfone 4 Pro ZS551KL, A64.
Specification	Zenfone 4 Pro ZS551KL	A64
Touchscreen	capacitive touchscreen	capacitive touchscreen
Display colors	16M	Unknown
Screen area	83.4 cm2	47.6 cm2
Screen format	16:9 (height:width)	3:2 (height:width)
Screen to body ratio	70.3%	59.1%
PPI /points per inch/	401 PPI	144 PPI
Screen protection	Corning Gorilla Glass 5	Unknown

Camera and Video

Camera and Video — specifications for Zenfone 4 Pro ZS551KL, A64.
Specification	Zenfone 4 Pro ZS551KL	A64
Rear camera, main	12 MP Dual	2 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	2 MP
Functions	HDR	LED flash
Video	1080p@30fps	Yes
Front camera, selfie	8 MP Single	0.3 MP Single
Specifications	8 MP f/1.9 1/3.2'' 22mm (wide) 1.4µm PDAF	VGA

Performance

Performance — specifications for Zenfone 4 Pro ZS551KL, A64.
Specification	Zenfone 4 Pro ZS551KL	A64
Processor CPU	Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)	Dual-core 1.2 GHz
Graphics processor GPU	Adreno 540	Unknown

General specs

General specs — specifications for Zenfone 4 Pro ZS551KL, A64.
Specification	Zenfone 4 Pro ZS551KL	A64
Release date	2017 August	2014
Colors	Moonlight White Pure Black	White Black
Historical recorded price Legacy catalogue value; date unknown. Not a current offer.	390 EUR	Unknown
Battery life	Talking time- Up to 27 h 30 min (3G)	Stand by time- Up to 150 h Talking time- Up to 8 h 20 min
Body build	Front/back glass (Gorilla Glass 5) & aluminum frame	Unknown

Communication and Connectivity

Communication and Connectivity — specifications for Zenfone 4 Pro ZS551KL, A64.
Specification	Zenfone 4 Pro ZS551KL	A64
SIM card	Hybrid Dual SIM (Nano-SIM dual stand-by)	Dual 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	Unknown
Speed	HSPA 42.2/5.76 Mbps LTE-A (3CA) Cat12 600/150 or 100 Mbps	Unknown
GPRS	Yes	Yes
Edge	Yes	Yes
Wi-Fi	Wi-Fi 802.11 a/b/g/n/ac dual-band WiFi Direct hotspot	Wi-Fi 802.11 b/g/n hotspot
GPS	Yes with A-GPS GLONASS BDS GALILEO	Yes
USB	Type-C 1.0 reversible connector	microUSB
Bluetooth	5.0 A2DP EDR LE aptX	2.0
Harmful irradiation	Unknown	SAR EU - 0.42 W/kg (head) 0.55 W/kg (body)

Music and Audio

Music and Audio — specifications for Zenfone 4 Pro ZS551KL, A64.
Specification	Zenfone 4 Pro ZS551KL	A64
Radio	FM radio	FM radio
Others	24-bit/192kHz audio -DTS sound -Active noise cancellation with dedicated mic	Unknown

Other features

Other features — specifications for Zenfone 4 Pro ZS551KL, A64.
Specification	Zenfone 4 Pro ZS551KL	A64
Dop	Sensors Fingerprint (front-mounted) accelerometer gyro proximity compass color spectrum Infrared port - Fast battery charging: 50% in 32 min	Sensors Accelerometer

Asus Zenfone 4 Pro ZS551KL vs Celkon A64