This NVR enables simultaneous live viewing of up to eight channels, or simultaneous playback of up to four channels, via its HDMI output or remote network access at display resolutions up to 3840 x 2160. Network bandwidth use is optimized while ensuring high-quality recording and playback using H.264 or MPEG compression. Audio output is supported, as is remote monitoring from iOS and Android devices, via the VIVO Cloud and iViewer apps. ONVIF compliance ensures compatibility with a wide range of surveillance equipment. The 2MP Wi-Fi Cube Camera from Vivotek features a 1/2.9" progressive CMOS sensor and 2.8mm fixed lens for capturing videos at a maximum resolution of 1920 x 1080 at up to 30 fps. It supports Smart Stream II technology to save up to 50% on bandwidth and storage requirements. The 2TB Purple 5400 rpm SATA III 3.5" Internal Surveillance Hard Drive from WD is designed to withstand the stresses placed on it in a 24/7 surveillance system with 8 drive bays. With support for up to 64 high-definition surveillance cameras, this 2TB hard drive can hold a large amount of data and gives you the ability to easily upgrade and expand your security system.