Radio bleeper, also known as a PAGER, is a device used to send and receive short messages. It is typically used by medical personnel, emergency services, and other professionals who need to be contacted quickly. The device is small and lightweight, making it easy to carry around. It is also capable of receiving signals from a variety of sources, such as radio towers, satellites, and cellular networks. The messages sent through the device are usually brief and can be programmed to alert the user when an important message is received.