It is very sofisticated device its function like second space, security app and finger sensor etc. are awesome. But after creation of second space its performance in 2GB RAM is affected and gets slower one. Its auto adjusting light sensor is also awesome whenever you goes into sunny it brightness increases automatically. The age sensor in both cameras are also told near about age. Its battery performance is good as it is having 4050 mAh battery and its burst shoot option with both voice increasing keys is as like as iphone 5s. The overall performance of this device is superb and you can purchase it without getting any hazzle.