This refers to the two rear cameras on its back

HTC One (M8)





The new HTC One (M8) comes with a radically different than all else 'Duo' camera (this refers to the two rear cameras on its back) that allows you things like selecting the focus of an image after you capture it.The new One also comes with the latest Snapdragon 801 quad-core system chip, an even more intense aluminum unibody construction, and 25% more powerful BoomSound front-facing stereo speakers. And it's not just that - HTC has improved the phone all around, even adding expandable storage via microSD cards of up to 128 gigs. Actually, the only change we can think of in the new One that could possibly bring forth some negativism is the increased overall footprint of the device - it's just larger and a bit bulkier.






HTC One (M8) detailed specifications
GENERAL
Release date
March 2014
Form factor
Touchscreen
Dimensions (mm)
146.36 x 70.60 x 9.35
Weight (g)
160.00
Battery capacity (mAh)
2600
Removable battery
No
Colours
Gunmetal Grey, Amber Gold, Glacial Silver
SAR value
NA
DISPLAY
Screen size (inches)
5.00
Touchscreen
Yes
Touchscreen type
Capacitive
Resolution
1080x1920 pixels
Colours
16M
HARDWARE
Processor
2.5GHz  quad-core
Processor make
Qualcomm Snapdragon 801
RAM
2GB
Internal storage
16GB
Expandable storage
Yes
Expandable storage type
microSD
Expandable storage up to (GB)
128
CAMERA
Rear camera
4-Ultrapixel
Flash
Yes
Front camera
5-megapixel
SOFTWARE
Operating System
Android 4.4.2
Skin
Sense 6.0
Java support
Yes
Browser
HTML
Browser supports Flash
No
CONNECTIVITY
Wi-Fi
Yes
Wi-Fi standards supported
802.11 a/ b/ g/ n/ ac
GPS
Yes
Bluetooth
Yes, v 4.00
NFC
Yes
Infrared
Yes
DLNA
Yes
Wi-Fi Direct
Yes
MHL Out
No
HDMI
No
Headphones
3.5mm
FM
Yes
USB
Micro-USB
Charging via Micro-USB
Yes
Proprietary charging connector
No
Proprietary data connector
No
Number of SIMs
1
SIM Type
Nano-SIM
GSM/ CDMA
GSM
3G
Yes
SENSORS
Compass/ Magnetometer
Yes
Proximity sensor
Yes
Accelerometer
Yes
Ambient light sensor
Yes
Gyroscope
Yes
Barometer
Yes
Temperature sensor
No