CL-900N1 is 2.4G OutdoorDay/Night Wireless CCD Camera,Support 1-4 Camera,Support MultiViewer software,Vista Support. MultiViewer is a 4-channel wireless video surveillance software for Windows. It has advanced video viewer separate algorithm, various alert functions including schedule timer sanp, channel control, and sound. It can handle up to 4-channels video input, captures images up to 30 frames per second from USB video capture device. It uses be installed in Windows's video encoder and audio encoder , high quality video and audio effect , record file format AVI. The files can played with Windows Media Player or Real Player etc. JPEG image snapshots can be made from video images. Other features include secure Manual Control Channel,audio listening etc. System requirements Windows 2000/XP or better 1.7GHz CPU or better 128M memory or better Microsoft DirectX 9.0C USB2.0 Interface Audio Card / True Color VGA Card