4ch Full Real-Time 25fps per channel 100fps 4ch Full D1 704*576 per channel Support Windows 7 64bits and all windows OS Specification: Channel: 4 Ch video/4 chAudio 25fps/channel both Preview and Recorder Compression mode: H264 Main Profile Preview resolution: D1(PAL:704*576NTFS 720*480) Record resolution: D1(PAL:704*576NTFS 720*480) Display resolution : Display resolution: more than 1024*600, recommend 1024x768, 1024x600 1440x900, 1280x1024, 1600x900, 1920x1080 Hard disk usage: 100-400M/ch/Hour PTZ protocal: Support many kinds of protocals OS support: WINDOW 7 64bits/WINDOWS 7 32bits/XP/VISTA/2003 server/2000 Network function: support DDNS and easy to Surveillance by Internet,support mobile phone surveillance Minimum requirements: USB 2.0 PC with 1GHz processor,256MB RAM,10G available Hard disk. 0.5KG/PCS.