Microsoft Lumia 540 Dual Sim has display Size 5.0", operating system Microsoft Windows Phone 8.1 with Lumia Denim. The device has ram 1 GB too, card support is microSD, up to 256 GB (dedicated slot), it has 8 GB, 1 GB RAM hard disk. Back camera 8 MP is awesome, front camera 5 MP is also not bad. Lumia 540 Dual Sim has power storage, Up to 26 h (2G) / Up to 15 h (3G). Device status is Available