The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From KeFu He:
viewnet 2500 is a mobile phone surveillance application just based on iPhone, which supports the full line of surveillance products, including digital video recorders,digital video servers, as well as network cameras and speed domes that support standard H.264 video codec. The key features of viewnet 2500 Mobile Surveillance Application include: Real-time video preview of up to 16 channels; Swipe for PTZ control and camera movement, pinch to zoom in and out in preview mode; Support for preset activation and configuration, as well as calibration for brightness.. Snapshot support; Management of up to 100 sets of devices. Device profiles can be added / deleted / modified.