Goolink Pro a easy P2P way to connect your ipc or dvr/nvr all over the world with no AD.Basic function introduction: 1.Stream Videos over WIFI or 3G/4G2.View up to 4 live video streams 3.Device management. 4.Snapshot and browse picture 5.Record and playback video 6.PTZ control 7.Landscape and Portrait orientation support 8.Two-way talk-back 9.Digital ZOOM 10.Using QRcode to add new device