Before deciding whether you will be using a multiplexer, or a quad, you should have in mind what is most important to you: Frame rate, or Picture clarity.. A multiplexer operates by sharing "time" between the multiple cameras connected to it. It essentially places one frame of video for one camera, then another for the next camera, and so on.. This allows the pictures recorded to maintain maximum resolution with only a loss in the overall frame rate per camera. The Quad shares "space." With four cameras on the screen in the "quad" arrangement, you wind up with each camera showing at half resolution both horizontally, and vertically. The frame rate typically remains "real time" however, and the jittery movement usually associated with multiplexers is not present. Either way, Both types of equipment allow us to maximize our security options with the use of less recording equipment. The product line is not limited merely to the items listed here. These are currently some of the most popular. If you have a special application, or would like to make purchases of several units at once, feel free to give us a call at 231-932-9550 with your quote requests. Color Quads B/W Quads Color Multiplexers B/W Multiplexers Switchers DVR Converters All Security Equipment, Surveillance Equipment and CCTV products come with a minimum 1 year warranty, and in some cases, the manufacturer may extend your CCTV products warranty even further. All prices shown are DELIVERED UPS std Ground, and there are no additional shipping charges unless other shipping arrangements are required. Government, and institutional Purchase orders accepted with prior approval. Please fax your purchase order directly to 231-346-5920, or call 231-932-9550 for details and toll free faxing. Thank you again for visiting cu1.com, your CCTV surveillance and security equipment experts. Please stop in again! Gladly Accepted.