The series encompasses the most popular models in China; it is very popular worldwide. It features advanced H.264 compression algorithms that not only improve image quality with low HDD capacity but also offer excellent network performance with low bandwidth. The SATA HDD and USB2.0 port improve stability and transfer speed of the HDD as well as USB compatibility and backup speed. Users can use flash drive, USB HDD, CD-RW/DVD-RW and network for backup. For playback, it supports four window simultaneous playbackthe first among Chinese products.