Product features: 1. D1 HD Audio Video Capture supports 4-channel real-time or 4-channel non-real-time video input. Enabling users to use it conveniently and quickly.. 2. Language: Chinese. English Russian. Spanish. French. Japanese Arab. Portuguese Turkey. German Dutch. Thai. Korean (Korean). 3. It adopts the currently popular H.264 Lv9 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. 4.USB DVR PCIE and PCI card can be mixed into a mixture of the same software can form a full HD video system. Product parameters: Video Compressed: H.264 Lv9 Video/audio channel: 4CH video and 1CH audio Display resolution: More than 800 x 600 Preview resolution: D1(PAL: 704 x 576 NTSC 720 x 576) Record resolution: D1(PAL: 704 x 576 NTSC 720 x 576) Hard disk usage: 50m/ch/hour Record resource: 25fps video& audio (PAL) 30fps video& audio (NTSC) Support all kinds of USB 2.0 laptop and pc Network function: Support DNS and easy to surveillance by internet Microsoft Windows XP / Win 7 / 8