Xolo era 4k is not working fast and very low power of tuch responce the camera is not perfect auto foucus.the battery is 4000mah but its low in 10 hrs.the full charging time of the battery is 4hrs.main features of the phone is not provide a perfect working system.the external storage of the phone is 8GB but ram is 2GB. Processor of the phone 1Ghz Quad core is very slow response