... distance; 802.11a/b/g/n Wifi moudle ,2000M distance IP Camera works demo link:http://gotcha.dyndns.biz:145 guest/guestSpecification ... linear channelAudio Input (callback)1 channel, microphone.Supported protocolsTCP, UDP, IP, HTTP, SMTP, DNS,ARP, ICMP, POP3, NTP, IPsec, UpnP, ... RS485 port, 1 RS232 portAlarm Input1channel on/off, NO and NC supportAlarm Output1 channel, 120VAC 1A/24VDC 1A.PowerDC 12V 0 ...