SilentSymphony-Learn-Talk is a 10-receiver stereo wireless listening system that broadcasts in stereo with a high-definition transmitter for superior sound. The transmitter connects to the included headset microphone and speaks directly to all wireless headphones without additional PA equipment. The wireless headphone receiver and high-definition stereo transmitter operate in 900mHz (908.70–926.30mHz), clear of TV, radio and Wi-Fi interference. Great for DJs putting on "silent" dance parties.