Karbonn Titanium Wind W4 has display Size 4.0", operating system Microsoft Windows Phone 8.1. The device has ram 512 GB too, card support is microSD, up to 32 GB, it has 4 GB, 512 MB RAM hard disk. Back camera 5 MP is awesome, front camera VGA is also not bad. Titanium Wind W4 has power storage, Up to 8 h. Device status is Available