... 4.Audio Compression: G.711 and AAC-LC IR IP Camera FeaturesCMOS image sensor Max. resolution: 1920*1080 Support ... with alarm serverBuilt-in SD Card Slot( optional)Support wireless LAN link (optional) Technical ParameterImage Sensor1/2.5", ... optional)Audio CompressionG.711; AAC-LCNetwork protocolTCP,UDP,IP,HTTP,FTP,NTP,SMTP,DHCP,DNS,ARP,ICMP, ... -20 °C ~ 60 °COperating Humidity0% -85% IR IP Camera