A cellular repeater is a device that amplifies and extends the coverage of a cellular signal. It captures weak signals from a nearby cell tower and boosts them, allowing for better reception in areas with poor connectivity, such as basements or rural locations. This technology is essential for improving communication quality and ensuring reliable mobile service. The system typically consists of three main components: an external antenna that receives the signal, an amplifier that boosts the signal strength, and an internal antenna that redistributes the enhanced signal within the building or area. Cellular repeaters are commonly used in both residential and commercial settings to enhance the performance of mobile devices.