Record from and manage up to four cameras with the 4-channel 4k uhd nvr (no hdd) from hikvision. It is equipped with a sata port that supports an hdd up to 6tb (available separately). H.265, h.265+, h.264, and h.264+ video codecs keep file sizes manageable while maintaining the best quality possible. Two-way audio communication is supported.Hikvision's is a 4-channel embedded plug and play network video recorder. A new generation recorder developed by hikvision independently, this nvr supports the new h.264+ intelligent compression which aims to reduce bandwidth and storage requirements by up to 50%. Additionally, this nvr combines multiple advanced technologies such as audio and video decoding technology, network technology and intelligent technology and features 4 poe network interfaces for easy plug and play setup