The EM 1031-U receiver has been designed for professional work. It will give you reliable operation over many years. All of Sennheiser´s professional expertise and more than fifty years of experience have gone into the creation of this state-of-the-art product. Compact, powerful and easy-to-operate true diversity receiver. For use with the BF 1081-U hand-held transmitter or the BF 1083-U pocket transmitter.