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 signal 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 through the headsets; ideal for walking tours conferences yoga and work-out classes. The transmitter and accessories are supplied in a padded carry case.