Versatile Compatibility & Bluetooth Function: The UHF wireless mic karaoke mixer system includes multiple connection ways. Audio input: bluetooth, 3.5mm ,USB and optical jack. Audio output: 6.35mm and 3.5mm jack. The microfonos inalambricos is ideal for variety of devices including smart TVs, PC, home receivers, soundbars, digital audio mixer, amplifier, speaker, karaoke machine for adults, karaoke system,etc. Adjustable Echo Effect & 16 Frequencies: This cordless 2 microphones system is with the function of adjusting echo effect, 16 adjustable frequencies and independent volume controls. It combines the professional function of microphone and adjustable echo effect, saving space at home, like a simple mixer.(NOTICE: The bluetooth function of this system cannot be used for bluetooth speakers. The bluetooth function supports for music input source such as set-top box of TV, phone, PC, DVD etc. ). Durable All Metal Built: This Metal UHF bluetooth wireless handheld microphone system are designed to last, suitable for daily use. Receiver and microphones are both metal built. 3 in 1 system, External Audio Interface Function: The system can be as microphone system, audio mixer and audio interface. It can be used as a simple Audio interface when connecting to PC via USB jack for music recording, recording sound or singing into PC via some PC recording software. Users can also connect PC to the microphone system via USB jack to play music source as karaoke mic. 280 Feet Operating Range: Its operation range is up to 280 feet line-of-sight, Ideal for karaoke singing, speech, meeting, party, church, wedding, DJ, performance, indoor or outdoor activities.