don't buy this product and don't buy from Flipkart. phone had both software and hardware issues, no techcian resolved but Flipkart wrote to me saying technician resolved and issue closed. seller also rejected replacement.
After using for a month I have found out some issues with vivo S1. While watching videos in FB or Instagram we can here the audio sound even if we get back.. because I think video playing in background after we got back and even scrolling down. otherwise battery is good. Sound comparing with vivo v9 S1 not much but OK.