... ,message, etc. alarmSystemSystem requirementMicrosoft Win98 SE/ME/2000/XP,Vista, Internet Explorer 5.0, NET4.5 or aboveFeaturesSecurity SettingsSupports three-level ... , operator, visitorDDNS(free)Free DDNS boundedSuperiorityp2p technology, mobile viewCenter management software(free)1,4,9,16,25,36 or 64 multiple ...