This wireless set is composed of 1 UHF handheld mic, one UHF belt transmitter and 1 UHF receiver dual channels. The frequencies between handheld mic and receiver are automatically set by IR

UHF dual channels receiver ( harmonized CEE frequencies )
16 selectable frequencies per channel
Diversity receiver
IR function ( frequency setup between receiver and transmitter via IR )
Outputs : 2x balanced ( XLR ) + 1x unbalanced ( Jack )
LCD display on receiver and transmitters
Max operating range : 100m
Delivered with 1 handheld mic, 1 belt transmitter and 1 headset mic