HDView (Hik Series 4MP WDR IP Dome Network Camera Built-in WiFi, Microphone, Audio Output, Alarm IO, 2.8mm Wide Angel Lens ONVIF, Oudoor/Indoor Use Please buy SAME Series of IP camera and NVR, because it's Private Connection. More stable than ONVIF connection. 2.8mm fixed focal lens, Build in WIFI Alarm, and Audio Maximum resolution of up to 4MP, Dual video streams IP66 weather-proof protection [Recommend Same Series HDView Brand NVR] Wide dynamic range of 120 dB, This is NOT Hikvision Retail Version, Please ask us for Tech Support, Firmware Upgrade and Warranty.