Archos Cesium 40 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 2 MP is also not bad. Cesium 40 has power storage, . Device status is Available