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Asus Zenfone 4 Pro ZS551KL

Asus Zenfone 4 Selfie Pro ZD552KL

Network
Technology	GSM / HSPA / LTE	GSM / HSPA / LTE
2G bands	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G Network	HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100	HSDPA 850 / 900 / 2100 - Global
		HSDPA 850 / 900 / 1900 / 2100 / 800 - TW/JP/HK
		HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - US/BR
4G Network	1, 2, 3, 4, 5, 7, 8, 17, 19, 20, 28, 38, 39, 40, 41 - Global, Taiwan	1, 3, 5, 7, 8, 20, 40 - Global
	1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 29, 30, 38, 39, 41 - US, Canada, Brazil	1, 3, 5, 7, 8, 18, 19, 26, 28, 38, 41 - TW/JP/HK
	1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 29, 30, 38, 39, 40, 41 - India	1, 2, 3, 4, 5, 7, 8, 12, 17, 28 - US/BR
Speed	HSPA 42.2/5.76 Mbps, LTE (3CA) Cat12 600/150 or 100 Mbps	HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps LTE (2CA) Cat6 300/50 Mbps - TW/JP/HK

Launch
Announced	2017, August	2017, August
Status	Available. Released 2017, October	Available. Released 2017, October

Body
Dimensions	156.9 x 75.6 x 7.6 mm (6.18 x 2.98 x 0.30 in)	154 x 74.8 x 6.9 mm (6.06 x 2.94 x 0.27 in)
Weight	175 g (6.17 oz)	147 g (5.19 oz)
Build	Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
SIM	Hybrid Dual SIM (Nano-SIM, dual stand-by)	Hybrid Dual SIM (Nano-SIM, dual stand-by)

Display
Type	AMOLED	AMOLED
Size	5.5 inches, 83.4 cm2 (~70.3% screen-to-body ratio)	5.5 inches, 83.4 cm2 (~72.4% screen-to-body ratio)
Resolution	1080 x 1920 pixels, 16:9 ratio (~401 ppi density)	1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
Protection	Corning Gorilla Glass 5	Corning Gorilla Glass 5

Platform
OS	Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo), ZenUI 4	Android 7 (Nougat), ZenUI 4
Chipset	Qualcomm MSM8998 Snapdragon 835 (10 nm)	Qualcomm MSM8953 Snapdragon 625 (14 nm)
CPU	Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)	Octa-core 2.0 GHz Cortex-A53
GPU	Adreno 540	Adreno 506

Memory
Card slot	microSDXC (uses shared SIM slot)	microSDXC (uses shared SIM slot)
Internal	64GB 6GB RAM, 128GB 6GB RAM	64GB 3GB RAM, 64GB 4GB RAM
		eMMC 5.1

Main Camera
Modules	12 MP, f/1.7, 25mm (wide), 1/2.55", 1.4µm, dual pixel PDAF, Laser AF, 4-axis OIS 16 MP, 50mm (telephoto), 1/3.1", 1.0µm, AF, 2x optical zoom	16 MP, 26mm (wide), dual pixel PDAF
Features	LED flash, HDR, panorama	Dual-LED dual-tone flash, HDR, panorama
Video	4K@30fps, 1080p@30/60fps, 1080p@120fps, 720p@240fps	4K@30fps, 1080p@30/60fps, 720p@120fps

Selfie Camera
Modules	8 MP, f/1.9, 22mm (wide), 1/3.2", 1.4µm, PDAF	12 MP, f/1.8, 25mm (wide), 1/2.55", 1.4µm 8 MP, 12mm
Features	HDR	LED flash, panorama, HDR
Video	1080p@30fps	4K@30fps

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

Comms
WLAN	Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct	Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Bluetooth	5.0, A2DP, EDR, LE, aptX	4.2, A2DP, EDR, LE
Positioning	GPS, GLONASS, BDS, GALILEO	GPS, GLONASS, BDS, GALILEO
NFC	Yes	No
Infrared port	Yes	No
Radio	FM radio	FM radio
USB	USB Type-C 2.0, OTG	microUSB 2.0

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

Battery
Type	Li-Ion 3600 mAh, non-removable	Li-Ion 3000 mAh, non-removable
Charging	18W wired, 50% in 32 min (advertised)	18W wired
Talk time	Up to 27 h 30 min (3G)

Misc
Colors	Moonlight white, Pure Black	Rouge Red, Sunlight Gold, Deepsea Black
Models	Z01GD, Z01GS	Z01MD, Z01MDA
Price	About 350 EUR	About 250 EUR