Perfect your karaoke with the Echo and Key Control function on the top panel. There's also a second input, so you can plug in another microphone for a duet or even a guitar and use your speaker as an amp. The optional Ult Mic includes a pair of durable, high-quality wireless karaoke mics, along with a mic jack receiver (6.3mm) for easy, always-ready connection to your Ult Tower (sold separately).