1) The document describes a capsule camera, also known as a pill camera, which is a pill-sized device that can be swallowed to take pictures inside the digestive tract to diagnose conditions.
2) The capsule contains a camera, lights, transmitter and batteries and transmits up to 50,000 color images as it passes through the digestive system, with the images being received by an external recorder.
3) The capsule camera provides a non-invasive alternative to endoscopy and is useful for diagnosing various conditions of the small intestine like Crohn's disease, ulcers, and tumors. It allows detection of disorders at an earlier stage compared to other tests.