The multifrequency transmitting ALT-105 serves as a replacement part or as an extension for the PA system W.A.M.S.-05. The unit operates in the UHF range of 863.100 - 864.900 MHz. The frequency range is divided into 16 channels, which can be selected as desired. The transmitter module allows for wireless transmission of the audio signal of the speaker system to receiving units RM-105 of further W.A.M.S.-05 systems (audio link mode). The unit is tuned to the frequencies of the receiver module.