Niu Tek 4d2 has display Size 4.0", operating system Android 4.4.2. The device has ram 512 GB too, card support is microSD, up to 64 GB, it has 4 GB, 512 MB RAM hard disk. Back camera 3.15 MP is awesome, front camera 1.3 MP is also not bad. Tek 4d2 has power storage, . Device status is Available