The document describes a capsule camera, or pill camera, which is a miniature camera that can be swallowed to examine the digestive tract. It consists of a lens, light source, battery and transmitter inside a capsule the size of a pill. The capsule passes naturally through the digestive system, taking pictures that are transmitted to a data recorder. The images allow physicians to detect conditions like Crohn's disease or tumors in the small intestine in a non-invasive way. While innovative, capsule endoscopy has limitations like inability to control the camera and risk of obstruction if narrowing is present.