... Video server AST-5804D-WSFour-Channel Encoder (with IDE storage)Technical Specification:Video Input 4 channel composite video, PAL or NTSC ... QuickTime , Real player and VLC player, Core player etcAlarm Input 4 channel on/off input, supporting NO (normally open) or NC ... (normally close) sense.Alarm Output 4 channel on/off output,120VAC 1A/24VDC 1AAlarm MessageSending alarm message ...