Oklahoma Sound LWM-5 Handheld Wireless Microphone, Designed only for Use with Wireless-Ready Lecterns and Wireless Receivers from Oklahoma Sound (Black) This wireless hand-held Mic uses a 9-volt battery Select channel A or B to eliminate outside frequency interruption Move freely up to 200 ft. away! Wireless handheld microphone is compatible with all Oklahoma Sound Corp. Sound Lecterns except the PRA-7000 Pro Audio Wireless Public Address System. Using this wireless microphone allows you audio wireless freedom of movement up to 200' from the lectern. Designed only for Wireless-Ready Lecterns and Wireless Receivers from Oklahoma Sound. These include the 800X series, 111PLS series, and the 6010 series. It does NOT work with other Brands of Lecterns or Receivers