Send email attachment with image. Save image on hard disk. Sound alarm. Video signal filter, for filter active and invalid channel. Motion detection. Adjustable sensitivity. Automatically lock while not any operation. Schedule monitoring sessions, for time snap. Record video/audio (with USB2.0 audio interface), snap shot. Automatic space management. Stop recorder or capture still automatically on disk full. Support 4 channel video input on one computer. Support on screen display. Support manual open/close invalid channel or add/delete channel description. Support login and logout by user name and password. Support running background stealthy.