An ERCES (Emergency Responder Communication Enhancement System) is a specialized communication system designed to improve wireless communication for emergency responders within large buildings, such as commercial properties, hospitals, or high-rise structures. It ensures reliable and clear communication during emergencies by enhancing radio signals within challenging indoor environments. ERCES typically consists of bi-directional amplifiers, distributed antenna systems (DAS), and other equipment that boost radio signals for public safety personnel, enabling effective communication, coordination, and response in critical situations.