Fangrui Product Details Wireless Mission System: The Es-386 Is A Wireless Mission Conversion System That Converts Your Wired Microphone Into A Wireless Microphone While Maintaining Maximum Audio Quality. Using Uhf Technology, Strong Anti-interference Ability. The Frequency Band Used Is 540.0mhz-590mhz , The Wireless Mission Range Reaches 98 Feet, And The Use Is Not Bound By The Cable, Free To Move. Device Compatibility: The Receiver Of The Es-386 Can Switch Operating Voltages (0v,3v,48v), Adapt Dynamic Microphones (0v) And Capacitive Microphones (3v,48v). There Is Also A Volume Adjustment Function (vol1-vol7), Which Allows You To Control The Volume Remotely. Rechargeable Battery: The Device Has A Built-in Rechargeable Battery That Can Last For About 5 Hours After A Full Charge, And You Can Charge Your Device At Any Time Via A Usb Cable Without Worrying About Excessive Use Time. Excellent Compatibility: The Device Is Free Of Xlr To 6.35 Adapters, The Mitter Is Compatible With Musical Instrument Microphones, Capacitive Microp