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Asus Zenfone 2 ZE551ML

Asus Zenfone Selfie ZD551KL

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 850 / 900 / 1900 / 2100	HSDPA 850 / 900 / 1900 / 2100
	TD-SCDMA - China & India
4G Network	1, 2, 3, 4, 5, 8, 9, 18, 19, 28 - Taiwan	1, 2, 3, 5, 7, 8, 20 - Global
	1, 2, 3, 4, 5, 7, 8, 20 - Global	1, 2, 3, 5, 6, 8, 9, 18, 19, 28 - Taiwan
	1, 2, 3, 4, 5, 7, 8, 17, 20 - US	1, 2, 3, 4, 5, 7, 8, 17, 20 - USA
	1, 3, 38, 39, 40, 41 - China & India	1, 3 - India
Speed	HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps	HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps

Launch
Announced	2015, January. Released 2015, March	2015, June. Released 2015, August
Status	Discontinued	Discontinued

Body
Dimensions	152.5 x 77.2 x 10.9 mm (6.00 x 3.04 x 0.43 in)	156.5 x 77.2 x 10.8 mm (6.16 x 3.04 x 0.43 in)
Weight	170 g (6.00 oz)	170 g (6.00 oz)
Build	Glass front (Gorilla Glass 3), plastic back, plastic frame	Glass front (Gorilla Glass 4), plastic back, plastic frame
SIM	Dual SIM (Micro-SIM, dual stand-by)	Dual SIM (Micro-SIM, dual stand-by)

Display
Type	IPS LCD	IPS LCD
Size	5.5 inches, 83.4 cm2 (~70.8% screen-to-body ratio)	5.5 inches, 82.6 cm2 (~68.3% screen-to-body ratio)
Resolution	1080 x 1920 pixels, 16:9 ratio (~401 ppi density)	1080 x 1920 pixels, 16:9 ratio (~403 ppi density)
Protection	Corning Gorilla Glass 3	Corning Gorilla Glass 4, oleophobic coating

Platform
OS	Android 5.0 (Lollipop), upgradable to 6.0 (Marshmallow)	Android 5.0 (Lollipop), upgradable to 6.0 (Marshmallow), ZenUI
Chipset	Intel Atom Z3580 (4 GB RAM model) Intel Atom Z3560 (2 GB RAM model)	Qualcomm MSM8939 Snapdragon 615 (28 nm)
CPU	Quad-core 2.3 GHz (4 GB RAM model) Quad-core 1.8 GHz (2 GB RAM model)	Octa-core (4x1.7 GHz Cortex-A53 & 4x1.0 GHz Cortex-A53)
GPU	PowerVR G6430	Adreno 405

Memory
Card slot	microSDXC (dedicated slot)	microSDXC (dedicated slot)
Internal	16GB 2GB RAM, 32GB 2GB RAM, 32GB 4GB RAM, 64GB 4GB RAM, 128GB 4GB RAM	16GB 2GB RAM, 32GB 3GB RAM
		eMMC 4.5

Main Camera
Modules	13 MP, f/2.0, AF	13 MP, f/2.0, 28mm (wide), 1/3.0", Laser AF
Features	Dual-LED dual-tone flash, panorama, HDR	Dual-LED dual-tone flash, panorama, HDR
Video	1080p@30fps	1080p@30fps

Selfie Camera
Modules	5 MP, f/2.0	13 MP, f/2.2, 1/3.1", 1.12µm, AF
Features		Dual-LED dual-tone flash
Video		1080p@30fps

Sound
Loudspeaker	Yes	Yes
3.5mm jack	Yes	Yes

Comms
WLAN	Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot	Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot
Bluetooth	4.0, A2DP, EDR	4.0, A2DP, EDR
Positioning	GPS, GLONASS	GPS, GLONASS, BDS
NFC	Yes	No
Infrared port	No	No
Radio	FM radio, RDS	FM radio, RDS
USB	microUSB 2.0, OTG	microUSB 2.0, OTG

Features
Sensors	Accelerometer, gyro, proximity, compass	Accelerometer, gyro, proximity, compass

Battery
Type	Li-Po 3000 mAh, non-removable	Li-Po 3000 mAh, removable
Charging	18W wired, 60% in 40 min (advertised)

Misc
Colors	Osmium Black, Sheer Gold, Glacier Gray, Glamor Red, Ceramic White	Pure White, Chic Pink, Aqua Blue
SAR EU	0.35 W/kg (head)
Models	Z00AD, Z00A	Z00UD, Z00UDH, Z00UDC, Z00UDB
Price	About 300 EUR	About 280 EUR

Tests
Performance	Basemark OS II 2.0: 1090 Basemark X: 12565	Basemark OS II 2.0: 883 Basemark X: 4915
Display		Contrast ratio: 928:1 (nominal), 1.680 (sunlight)
Camera	Compare PHOTO / Compare VIDEO
Loudspeaker	Voice 62dB / Noise 61dB / Ring 67dB	Voice 65dB / Noise 66dB / Ring 75dB
Audio quality		Noise -92.1dB / Crosstalk -92.5dB
Battery (old)	Endurance rating 59h	Endurance rating 63h