DOOGEE HITMAN DG850 smartphone has MT6582 quad core CPU 1.3GHz Android 4.4 and supportsWake Gesture, HotKnot ,3 Finger Screenshot, Back Touch Taking Picture Function, OTG, Light sensor and Proximity sensor. 
 

Features:
Dual SIM Card Dual Standby.
5" IPS 1280 * 720px capacitive touch screen, quite sensitive.
Dual Cameras, 8MP front camera, 13MP back camera with flashlight and auto focus.
1GB RAM 16GB ROM.
MT6582 quad core CPU, 1.3GHz Android 4.4.
Back touch taking picture function, click "Camera" icon, turn on the " Back Touch Taking Picture" function, then you can take pictures by clicking on the touch panel that back of this phone. 
Support Wake Gesture, HotKnot, 3 Finger Screenshot, Light sensor, Proximity sensor, WIFI, Ebook, Email, Messaging, Wallpapers, Calendar, Calculator, Clock, etc.

Specifications:
 

Basic Information
Model DOOGEE HITMAN DG850
Band

2G: GSM 850/900/1800/1900MHz;

3G: WCDMA 900/2100MHz

Sim Card Dual SIM Card Dual Standby
Service Provided Unlocked
Style Bar
Color Black, White (Optional)
Shell Material Plastic
Battery 2500 mAh
System
OS Android 4.4 OS
CPU MT6582 Quad Core 1.3GHz
ROM 16GB
RAM 1GB
Screen
Display Size 5 Inch
Type Capacitive touch screen
Resolution 1280 * 720 pixels
Screen IPS
Other Features
Audio MP3/ AWB
Video 3GP/ MPEG4
Image JPEG/ BMP/ GIF/ PNG
E-book TXT/ CHM/ DOC/ HTML
FM Radio Yes, earphone needed
Earphone Port 3.5mm
Data Transfer & Connectivity
 
Data Transfer USB / Bluetooth
Mobile Internet WAP / WIFI
General
Camera 8MP front camera, 13MP back camera with flashlight and auto focus
Multilanguage English, German, French, Spanish, Italian, etc.
Card Extend NO
Message SMS / MMS
Input Handwrite / Keypad
GPS Yes
WiFi Yes
Bluetooth BT4.0
Proximity Sensor Yes
Light Sensor Yes
Other Features Wake Gesture, HotKnot ,3 Finger Screenshot, Back Touch Taking Picture Function, WIFI, Ebook, Email, Messaging, Wallpapers, Calendar, Calculator, Clock, etc.
Other Information
Product Size Approx. 13.93 * 6.85 * 0.88cm / 5.5 * 2.7 * 0.3in
Product Weight Approx. 160g / 5.64oz
Package Size

Approx. 19.5 * 11 * 4.5cm / 7.7 * 4.3 * 1.8in

Package Weight Approx. 406g / 14.3oz

Package List:
1 * Cellphone 
1 * Earphone
1 * Protective back case 
1 * USB cable
1 * Charger 
1 * User manual (English)
1 * Screen protector
1 * Micro cloth 
1 * SIM/SD Card eject tool
1 * Nano SIM to Micro SIM adaptor