Based on Cloud Technology, which enables users to use mobile surveillance without difficult setting like port forwarding any more! You just need to plug the DVR or IPC, then register in XM Cloud Server then you can view the device via iOS devices. Advanced Features: 1.Audio 2.remote playback 3.online alarm 4.auto play 5.video scale 6.frame type 7.priority type other controling functions, User-friendly UI.