AKG PW45 Vocal Set ISM, UHF wireless system, With Handheld transmitter, 4 Switchable frequencies in frequency range ISM: 863,100 - 864,900 MHz, 9.5"" Diversity-receiver with integrated antennas, Adjustable output volume, XLR out, Dynamic handheld transmitter with cardioid characteristics, Operates with 1x AA