As the DVR product specially developed for the USB interface, the USB DVR product adopts the mainstream USB chip manufactured by CYPRESS. It has elegant black appearance and small volume, and it is easy to carry. The latest CONEXANT10-bit high definition ADC adopted at the front end features clear image effect and smooth data, and supports 4-channel real-time or 4-channel non-real-time video input. Due to the fact that it adopts the USB2.0 interface, supports D1 collection and has sound compatibility, it is suitable for monitoring small systems or using a notebook computer to conduct monitoring, and it is very convenient and practical. It adopts the currently popular H264 compression technology, which features clear image and the unique electronic amplification function and the disk pre-allocation system, enabling users to use it conveniently and quickly. (****The first time you use the QQDVR, remember that the software installs in a "LOCKED" state as a default, and you have to use the "user name" and "password" to unlock it, and configure it.The user name and password are both the same word "admin"...)