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Asus Zenfone 2 ZE551ML

Sony Ericsson Xperia X2

Network
Technology	GSM / HSPA / LTE	GSM / HSPA
2G bands	GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2	GSM 850 / 900 / 1800 / 1900
3G Network	HSDPA 850 / 900 / 1900 / 2100	HSDPA 900 / 1900 / 2100
	TD-SCDMA - China & India	HSDPA 850 / 1900 / 2100 - XPERIA X2a
4G Network	1, 2, 3, 4, 5, 8, 9, 18, 19, 28 - Taiwan
	1, 2, 3, 4, 5, 7, 8, 20 - Global
	1, 2, 3, 4, 5, 7, 8, 17, 20 - US
	1, 3, 38, 39, 40, 41 - China & India
Speed	HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps	HSPA 7.2/2 Mbps

Launch
Announced	2015, January. Released 2015, March	2009, September. Released 2010, January
Status	Discontinued	Discontinued

Body
Dimensions	152.5 x 77.2 x 10.9 mm (6.00 x 3.04 x 0.43 in)	110 x 54 x 16 mm (4.33 x 2.13 x 0.63 in)
Weight	170 g (6.00 oz)	155 g (5.47 oz)
Keyboard		QWERTY
Build	Glass front (Gorilla Glass 3), plastic back, plastic frame
SIM	Dual SIM (Micro-SIM, dual stand-by)	Mini-SIM
		Optical trackpad

Display
Type	IPS LCD	TFT resistive touchscreen, 65K colors
Size	5.5 inches, 83.4 cm2 (~70.8% screen-to-body ratio)	3.2 inches, 29.1 cm2 (~49.1% screen-to-body ratio)
Resolution	1080 x 1920 pixels, 16:9 ratio (~401 ppi density)	480 x 800 pixels, 5:3 ratio (~292 ppi density)
Protection	Corning Gorilla Glass 3
		XPERIA panels UI

Platform
OS	Android 5.0 (Lollipop), upgradable to 6.0 (Marshmallow)	Microsoft Windows Mobile 6.5/6.5.2 Professional
Chipset	Intel Atom Z3580 (4 GB RAM model) Intel Atom Z3560 (2 GB RAM model)	Qualcomm MSM7200A
CPU	Quad-core 2.3 GHz (4 GB RAM model) Quad-core 1.8 GHz (2 GB RAM model)	528 MHz ARM 11
GPU	PowerVR G6430	Adreno 130

Memory
Card slot	microSDXC (dedicated slot)	microSDHC (dedicated slot)
Internal	16GB 2GB RAM, 32GB 2GB RAM, 32GB 4GB RAM, 64GB 4GB RAM, 128GB 4GB RAM	110MB 256MB RAM 512MB ROM

Main Camera
Modules	13 MP, f/2.0, AF	8 MP, AF
Features	Dual-LED dual-tone flash, panorama, HDR	LED flash
Video	1080p@30fps	w480p@30fps

Selfie Camera
Modules	5 MP, f/2.0	Videocall, via SW update
Video

Sound
Loudspeaker	Yes	Yes, with stereo speakers
3.5mm jack	Yes	Yes

Comms
WLAN	Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot	Wi-Fi 802.11b/g, DLNA
Bluetooth	4.0, A2DP, EDR	2.1, A2DP
Positioning	GPS, GLONASS	GPS, A-GPS
NFC	Yes
Infrared port	No	No
Radio	FM radio, RDS	Stereo FM (via software update)
USB	microUSB 2.0, OTG	microUSB 2.0

Features
Sensors	Accelerometer, gyro, proximity, compass	Accelerometer
		MP3/WAV/eAAC+/WMA player MP4/Xvid/WMV9/H.264 player TV Out YouTube application Pocket Office Photo editor Organizer Voice memo/dial Predictive text input

Battery
Type	Li-Po 3000 mAh, non-removable	Removable Li-Po 1500 mAh battery (BST-41)
Charging	18W wired, 60% in 40 min (advertised)
Stand-by		Up to 500 h (2G) / Up to 640 h (3G)
Talk time		Up to 10 h (2G) / Up to 6 h (3G)
Music play		Up to 20 h

Misc
Colors	Osmium Black, Sheer Gold, Glacier Gray, Glamor Red, Ceramic White	Elegant Black, Modern Silver
SAR EU	0.35 W/kg (head)	0.90 W/kg (head)
Models	Z00AD, Z00A
Price	About 300 EUR	About 140 EUR

Tests
Performance	Basemark OS II 2.0: 1090 Basemark X: 12565
Camera	Compare PHOTO / Compare VIDEO
Loudspeaker	Voice 62dB / Noise 61dB / Ring 67dB	Voice 66dB / Noise 69dB / Ring 65dB
Audio quality		Noise -81.3dB / Crosstalk -93.1dB
Battery (old)	Endurance rating 59h