Take your silent disco anywhere with this handy battery powered, bluetooth capable UHF transmitter; for use with the W Audio SDPRO silent disco headphones. There is no limit for the number of headphones receiving from each transmitter, up to three transmitters maybe used if each transmitter is switched to a different channel allowing up to three audio sources to be played back to the audience. The RF transmission system operates on 863-865Mhz in the license-free CH70 spectrum. This hands-free, wireless transmitter includes a headset microphone, which can be used to speak over the music to guests through the headsets; ideal for walking tours, conferences, yoga and work-out classes. The transmitter and accessories are supplied in a padded carry case.