The ZTE Z7
is a flagship device released in July 2014 by Chinese company ZTE. It features a 5.5" 1440 x 2560 display, giving it 538 pixels-per-inch. It's powered by a quad-core 2.5GHz Snapdragon 801 processor and 3GB of RAM., and comes with 32GB internal storage, 13MP camera and 3000mAh battery.
The ZTE Z7 Max has the same features as the Z7 but with a lower resolution display of 1080 x 1920, and less RAM with 2GB.
The ZTE Z7 Mini is a smaller version of the Z7, sporting a 5" 1080 x 1920 display, 2GB of RAM, 16GB internal storage and a smaller 2300mAh battery.