The offered product is a 16-channel digital video recorder from Dahua Security. A digital video recorder (DVR) is a consumer electronics device that records video in digital format to a mass storage device like a USB flash drive, hard disk drive, or other storage devices. A digital video recorder has many advantages over other video recording options, including the lack of tape, faster data retrieval, and higher image quality. It is primarily used in home entertainment and security systems. A magnetic HD, such as the ones seen in microcomputers, can digitally store hundreds of photos and hours of video. Coaxial cables can be used to connect DVRs to analog cameras, allowing them to be accessed remotely.