Rockville RKI65BT is a dual UHF wireless microphone system with Bluetooth, karaoke interface, and mic mixer. It connects to home audio receivers, televisions, iPads, computers, and more. With Bluetooth input, 3.5mm aux input, optical input, and coaxial input, you can enjoy various audio sources. It features adjustable echo, tone control, and music input volume, as well as independently adjustable mic levels. The wireless microphones have 8 switchable frequencies to minimize interference.