Asus Zenfone 4 Pro ZS551KL vs Lava Iris 503: 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.

Display technology

OLED versus LCD

Zenfone 4 Pro ZS551KL:

OLED

Iris 503:

LCD
Width

Iris 503: 2.3 mm narrower

Zenfone 4 Pro ZS551KL:

75.6 mm

Iris 503:

73.3 mm
Screen diagonal

Iris 503: 0.5 in smaller diagonal

Zenfone 4 Pro ZS551KL:

5.5 in

Iris 503:

5 in
Rear camera layout

Zenfone 4 Pro ZS551KL:

Dual

Iris 503:

Single
Depth

Zenfone 4 Pro ZS551KL: 2.9 mm thinner

Zenfone 4 Pro ZS551KL:

7.6 mm

Iris 503:

10.5 mm
Height

Iris 503: 13.7 mm shorter

Zenfone 4 Pro ZS551KL:

156.9 mm

Iris 503:

143.2 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 +13.7 mm versus Iris 503
Width:

75.6 mm +2.3 mm versus Iris 503
Depth:

7.6 mm
2. Iris 503

Height:

143.2 mm
Width:

73.3 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
2. Iris 503

175 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. Iris 503

Screen diagonal:

5 in

Aspect ratio (height:width):

16:9

Approximate rectangular screen area:

68.9 cm²

Zenfone 4 Pro ZS551KL has approximately 21% more rectangular screen area than Iris 503.

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, Iris 503, compared at the same storage capacity.
Storage	Zenfone 4 Pro ZS551KL	Iris 503
64 GB	6 GB RAM	Unknown
128 GB	6 GB RAM	Unknown

Iris 503: Original memory entry

4 GB · 512 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. Iris 503

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

+1600 mAh versus Iris 503
2. Iris 503

2000 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. Iris 503

Everyday essentials

Everyday essentials — specifications for Zenfone 4 Pro ZS551KL, Iris 503.
Specification	Zenfone 4 Pro ZS551KL	Iris 503
Dimensions (HxWxD)	156.9 Х 75.6 Х 7.6 mm	143.2 Х 73.3 Х 10.5 mm
Weight	175 g	175 g
Technology	AMOLED	IPS LCD
Screen size	5.5" inch	5" inch
Screen resolution	1080 x 1920 px	540 x 960 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	4 GB 512 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	2000 mAh Removable Li-Ion
Operating system OS	Android 7.1.1 (Nougat) upgradable to Android 8 (Oreo); ZenUI 4	Android 4.2 (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, Iris 503.
Specification	Zenfone 4 Pro ZS551KL	Iris 503
Touchscreen	capacitive touchscreen	capacitive touchscreen
Display colors	16M	16M
Screen area	83.4 cm2	68.9 cm2
Screen format	16:9 (height:width)	16:9 (height:width)
Screen to body ratio	70.3%	65.7%
PPI /points per inch/	401 PPI	220 PPI
Screen protection	Corning Gorilla Glass 5	Unknown

Camera and Video

Camera and Video — specifications for Zenfone 4 Pro ZS551KL, Iris 503.
Specification	Zenfone 4 Pro ZS551KL	Iris 503
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
Functions	HDR	panorama
Video	1080p@30fps	Yes
Front camera, selfie	8 MP Single	1.3 MP Single
Specifications	8 MP f/1.9 1/3.2'' 22mm (wide) 1.4µm PDAF	1.3 MP

Performance

Performance — specifications for Zenfone 4 Pro ZS551KL, Iris 503.
Specification	Zenfone 4 Pro ZS551KL	Iris 503
Processor CPU	Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)	Dual-core 1.0 GHz
Graphics processor GPU	Adreno 540	Mali-400

General specs

General specs — specifications for Zenfone 4 Pro ZS551KL, Iris 503.
Specification	Zenfone 4 Pro ZS551KL	Iris 503
Release date	2017 August	2013 October
Colors	Moonlight White Pure Black	Black
Historical recorded price Legacy catalogue value; date unknown. Not a current offer.	390 EUR	90 EUR
Battery life	Talking time- Up to 27 h 30 min (3G)	Unknown
Body build	Front/back glass (Gorilla Glass 5) & aluminum frame	Unknown

Communication and Connectivity

Communication and Connectivity — specifications for Zenfone 4 Pro ZS551KL, Iris 503.
Specification	Zenfone 4 Pro ZS551KL	Iris 503
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	Show all network frequencies: -2G - GSM 900 / 1800 - SIM 1 & SIM 2
Speed	HSPA 42.2/5.76 Mbps LTE-A (3CA) Cat12 600/150 or 100 Mbps	HSPA
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
GPS	Yes with A-GPS GLONASS BDS GALILEO	Yes with A-GPS
USB	Type-C 1.0 reversible connector	microUSB 2.0
Bluetooth	5.0 A2DP EDR LE aptX	Yes

Music and Audio

Music and Audio — specifications for Zenfone 4 Pro ZS551KL, Iris 503.
Specification	Zenfone 4 Pro ZS551KL	Iris 503
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, Iris 503.
Specification	Zenfone 4 Pro ZS551KL	Iris 503
Dop	Sensors Fingerprint (front-mounted) accelerometer gyro proximity compass color spectrum Infrared port - Fast battery charging: 50% in 32 min	Sensors Accelerometer For India

Asus Zenfone 4 Pro ZS551KL vs Lava Iris 503