VIVOTEK Outdoor 4MP WDR PRO Smart Tracking Speed Dome Network Camera (VIVOTEK SD9374-EHL) - CPU: Multimedia SoC (System-on-Chip), Operating System:Microsoft Windows 8/7 Mac 10.12 (Chrome only), RAM: 1GB, Flash: 128MB, Storage Slot type: MicroSD/SDHC/SDXC card slot; Seamless Recording, Resolution: 2560x1440, Image Sensor: 1/2" Progressive CMOS, Video Compression: H.265, H.264, MJPEG, IR Illuminators: Built-in IR Illuminators up to 250 meters with Smart IR II, 2 x IR LED, Maximum Streams: 4 Simultaneous Streams, Audio Capability: Two-way audio (full duplex), Audio Interface: External microphone input; External line output, Network Users: Live viewing for up to 10 clients, Interface: 10 Base-T/100 BaseTX/1000 BaseTX Ethernet (RJ45), Connectivity: 1 x RJ-45 cable connector for 10/100/1000Mbps Network PoE connection, 1 x Audio input, 1 x Audio output, 1 x AC/DC 24V power input, 4 x Digital input, 2 x Digital output, 1 x RS-485 for PTZ control (PelcoD protocol, Baud rate 2400)