This karaoke mixer system is brand new, in the box. The Sound Town SWM15-PRO is a compact karaoke microphone mixer system. It comes with dual-channel, 8 selectable UHF frequencies per channel (16 channels in total) and is interference-free. The HD, 3.5mm (1/8) input and output connectors and built-in Bluetooth make it easy to connect. The SWM15-PRO can be connected to various devices including TV box, smart TV, home theater systems, receivers, speakers, soundbars, amplifiers, notebooks, tablets, and more. The microphone receiver and sound mixer enables you to mix mic signal with music without using an additional mixer. It comes with two wireless microphones and can support two wired dynamic microphones (not included). The rotatory control knobs can swiftly adjust the volume of your music, microphone, echo and tone to the desired level. It is ideal for karaoke, DJ music and house parties. Depending on the input connectors on your soundbar or home receiver, the Audio Out port serves as either an AUX or optical output. The 3.5mm AUX audio cable and mini Toslink to Toslink optical cables are included in the package. The dual-purpose output makes it a breeze to connect the SWM15-PRO system to almost any soundbar or receiver including Bose 300/500/700, Samsung, Vizio, etc.