Strong Performance with Microphones Battery-powered & Excellent Sound Quality The microphones are powered by two AA batteries, and the digital display shows the battery level and channel.It can effectively reduce background noise and provide excellent and clear sound quality. Two modes of operation Button ControlRemote ControlIndividual channel volume control Convenient Voice-over: Ducking Turn down the music when the peple speaks, ducking may be used to combat the muffling and distancing effect of reverb and delay. (Optional) Bluetooth Cordless Microphone Set Connects to microphone via Bluetooth Connects directly to amplifiers, stereos, audio processors, DJ mixers PA public address microphone audio control receiver Home theater and office karaoke style vocals Bluetooth wireless music streaming capability Plug and play operation UHF audio transmitter Signal stability UHF open space range is 200FTBluetooth connection range is 32FTInput Compatibility : TV, desktop computer, home theater, karaoke machine, mobile phone, laptop, tablet, USB, etcOutput Compatibility : Amplifier, Speaker, Mixer, etc