4.4.3 APK Installer
Tap APK installer icon 
on main menu or desktop enter installing interface, to get details from 3.10 APK chapter.
4.4.4 Device Setting
Tap 
of main menu or desktop to set wireless and network, sound and backlight, location and safety, application and so on, slide on screen to page up/down
4.4.4.1 Wireless And Network Settings
Details please refer to WIFI setting in Chapter3.6
4.4.4.2 Voice and Display Settings
zTap 【sound&display】enter to settings interface
a Media volume settings:：
tap 【media volume】to enter setting interface ,then to set up music and video volume
b Ringtones settings
to choose any of defaults ringtones：
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