Product DescriptionName:DoorcamFeatures:Make video phone call with visitors・and short time recording・know visitor's information without door open.OS:Embedded Linux OSSystem security: three-level user authority managementOnline visitor:Support up to 4 online visitors simultaneouslyDDNS: Built in free DDNSProcessor:Built in arm926 @ max 440mhz and high-speed v Image sensorSensor: Support AWB・ AGC・ ・ BLCSensor size: 84mmx2 16mm Power supply: 5V / 2AHousing material:ABS PlasticNight Vision:5 Meters