For owners of an ULT POWER SOUND series speaker, you can give your guests the ability to sing karaoke with this ULT MIC Wireless Microphone Set from Sony. The set includes a pair of wireless microphones and a receiver with a 6.3mm plug. You only need to plug the receiver into a single microphone port to use both microphones wirelessly. The mics feature noise reduction to block interference from breaths or wind, and are optimized to produce a bright and natural sound. If you sing duets, activate Duet Assist to balance the volumes of both mics for perfect harmonies. The mics can last up to 20 hours on a single charge, which is more than enough for nonstop karaoke entertainment.