The document describes a pill-sized camera that can be swallowed to take pictures of the digestive tract. It consists of a camera, lights, transmitters and batteries in a capsule sized at 26x11mm. As it travels through the digestive system, it takes 50,000 color images which are transmitted to an external recorder and computer. The capsule helps diagnose conditions like Crohn's disease and tumors of the small intestine in a non-invasive way. It provides high quality images and has advantages over conventional endoscopy, though early models had disadvantages of getting stuck or lack of control that newer technologies have helped overcome.