Ark S503 (New) vs Asus Zenfone 4 Pro ZS551KL

HSDPA 900, 2100

HSDPA 800, 850, 900, 1700(AWS), 1800, 1900, 2100

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LTE frequency 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 frequency band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700), 18(800), 19(800), 20(800), 26(850), 28(700), 29(700), 30(2300), 38(2600), 39(1900), 41(2500) - US, Canada, Brazil; LTE frequency band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 17(700), 18(800), 19(800), 20(800), 26(850), 28(700), 29(700), 30(2300), 38(2600), 39(1900), 40(2300), 41(2500) - India

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42.2 Mbps

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5.76 Mbps

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LTE-A, (3CA) Cat12, 600 Mbps download, 150 Mbps upload

2019

2017-8

2019

2017-10

Plastic

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Dual SIM (Micro-SIM, dual SIM stand-by)

Hybrid Dual SIM (Nano-SIM, dual stand-by)

152 mm

156.9 mm

73 mm

75.6 mm

7.8 mm

7.6 mm

157 g

175 g

Black

Moonlight white, Pure Black

IPS capacitive touchscreen

AMOLED capacitive touchscreen

480 x 960 pixels

1080 x 1920 pixels

195 ppi

401 ppi

2.5D curved glass screen

Corning Gorilla Glass 5

Yes

Yes, max 10 fingers

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Octa-core

Quad-core 1.3 GHz Cortex-A7

Quad-core 2.45 GHz Kryo

quad-core 1.9 GHz Kryo

Mediatek MT6580

Qualcomm MSM8998 Snapdragon 835

Mali-400 MP2

Adreno 540

1 GB

6 GB

8 GB

64, 128 GB

microSD, microSDHC

microSD(uses second SIM slot)

32 GB

256 GB

Android 6.0 Marshmallow

Android 7.1.1 (Nougat)

Single

Dual

5 MP

12 MP, f/1.7 , 25 mm, 2x optical zoom

16 MP, 50 mm

2592 x 1944 pixels

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720p@30fps

2160p@30fps, 1080p@30/60fps, 1080p@120fps, 720p@240fps

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laser/phase detection autofocus

dual LED flash

LED flash

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4-axis optical image stabilization

Autofocus, continuous shooting, digital zoom, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode

25mm (1/2.55" sensor size, 1.4 µm pixel size), 50mm (1/3.1" sensor size, 1.0 µm pixel size), geo-tagging, touch focus, face detection, HDR, panorama

LED flash

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2 MP

8 MP, f/1.9 , 22 mm, 1.4 µm

1600 x 1200 pixels

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480p@30fps

1080p

Yes

Yes, dual speakers

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Vibration; MP3, WAV ringtones

Yes

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FM Radio

-

-

FM radio

Wi-Fi 802.11b, 802.11g, 802.11n

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac

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Yes

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Yes

microUSB 2.0

Type-C reversible connector

v4.0

v5.0

-

Yes

-

Yes

-

Yes

-

Yes

-

Yes

-

Yes

-

Yes

-

Yes

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SMS(threaded view)

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MMS

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Email

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IM

-

Push Email

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No

Accelerometer, proximity, light

Fingerprint (front-mounted), accelerometer, color spectrum, compass, gyro, proximity

2000 mAh

3600 mAh

Removable

Non-removable

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50% in 32 min

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27 h 30 min