I am using Asus in zenfone 5 model At list from 1 year 6 month plz do not purches this phone because this battery backup very low.
Overall this mobile is very nice features like PC LINK, you can connect your phone with pc, laptop etc. But this mobile camera quality is bad as compared prize. All Asus mobile design are same but this look not a stylish. This mobile in 8 GB internal storage and external you can add 64 GB
This mobile hang when internal storage are fully used.
But you have a option to save battery click on autostart manager then deny the app you just not a need.