About this item FLEXIBLE CONNECTION OPTIONS: With HD Audio Return Channel (input only) and HD, Optical (Toslink), 3.5mm AUX input & output ports, the SWM16-MAX is compatible with a variety of devices such as smart TVs, home receivers, soundbars and etc. EASY TO SET UP: The HD Audio Return Channel and Optical inputs on the SWM16-MAX karaoke mixer allows you to extract the audio from your smart TV to the mixer, blends the music and vocal, and sends the mixed signals to a soundbar or amplifier (HDMI cable is not included) INTERFERENCE FREE: The wireless microphone system comes with Ultra-High Frequency (UHF, 550-590 MHz) which is less likely to get interference from other equipment compared with a VHF system. It has 16 selectable frequencies (8 frequencies each channel) and is compliant with the latest FCC regulations