The APR474 is an adaptive picture rejuvenator for use in all CCTV video installations to improve the quality of your video images. It has the ability to extend the use of Coax Cable video runs up to 5000 feet without the need for equipment on the sending end. This single ended solution will automatically remove distortion and sharpen your video images from color and B/W cameras. It is especially useful in systems that switch cameras with different lengths of cable. Each card has four independent control systems to regulate four video channels.