I have one lectrosonics UCR 195 524.500, one lectrosonics UM 200 Block 20, and lapel mic This system works together, very high quality, was actually part of large rental packages used at the 96 Atlanta Olympics. All battery contacts are clean and in good shape, all xlr, t5m connectors in excellent shape, the receiver is single frequency, the body pak transmitters is frequency agile block 20 Working system unit removed out of a AV rental production company