From Manufacturer: The ELENCO ® FM-88K Kit is a monophonic , two-IC , FM (frequency modulation) receiver designed to receive FM signals in the frequency range (88 - 108MHz). It uses electronic auto-scan to search for FM stations. This scan system is done with two button switches - one switch scans up , the other resets to the start of the tuning position . Requires one (1) 9V battery.