It can enlarge your smart mobile phones display when watch the bigger screen at longer distance, built with phone holder, you can watch a film, see any video or read from your phone hands-free. Great for elders to read newspaper in the watch the news on the internet as a magnifying glass. Especially suitable for watching 3D movies and 3D effect is stronger. It can protect the eyes from long watching 3D-like visual enjoyment. Reduce the problem of watching small screen for long time that eyes will be very uncomfortable and harmful.