H.264 Indoor WIFI IP Camera: 1.Lens: Standard 3.6mm 2.Embedded Linux OS ... ,16,25,36, 64,81-channel , no user limited , centralized monitor, remote record and playback , Skype message alarm, skype telephone alarmSystemOperation ... tf card NetworkSocketRJ-45 10/100Mb self-adaptable Ethernet slotProtocolTCP/IP,HTTP,TCP,ICMP,UDP,ARP, IGMP,SMTP,FTP,DHCP,DNS ...