A county legislative body may by resolution create an emergency communications district within all or a part of the territory of the county if the creation of the district is approved by the voters at a referendum election in the area proposed for the district. T.C.A. § 7-86-104.  In most counties, if an emergency communications district is created, its board of directors consists of seven to nine members appointed by the county mayor subject to confirmation by the county legislative body for terms of four years, except for the initial terms of two, three and four years to create a staggered system.  Requirements regarding membership on the board of directors in Shelby, Davidson, Knox and Hawkins counties are somewhat different due to exceptions made by narrow population class in the general law. T.C.A. § 7-86-105.  This board manages the emergency communication system (911) within its area according to the powers given to it by general law at T.C.A. § 7-86-101 et seq.