Specifications include, but are not limited to: The siren upgrade will consist of replacing the existing AC powered, omni-directional mechanical siren with a solar powered, omni-directional mechanical siren. The new siren will be rated at a minimum of 121 dB and have power operating 48 Volt DC with a solar panel charging system. The siren equipment shall be an American Signal Corporation (ASC), TempestTM-121 Siren. The siren will be activated by a Central Station Controller (two-way activation and monitoring) that is located at the St. Charles County Emergency Management Agency, as well as the back-up portable encoder. The City of St. Charles also has a secondary back-up encoder located at the St. Charles City Criminal Justice Center facility.