High Quality Wireless Karaoke Microphone: Microphone With High Sensitivity Professional Dynamic Microphone, Signal Stability. Transmission Distance Max To 160 Feet (50m).The Mic Case Is Alloy Material, Wear And Impact Resistant. | Easy To Use Microphone: Plug and play, no need for extra setting. microphones for Karaoke, Singing, Stage, Wedding, Speech, Karaoke Machine, Speaker, Amplifier, Mixer etc. Not support Bluetooth speakers. | Battery And Display：The microphone uses 2 AA batteries (batteries not included in the package), The receiver is built-in 650 mAh battery for 4 hours use time and fully charged in 3 hours.The display can tell you the working status of the microphone. | Multipurpose Microphone: The microphone system built in 15 channels, and the anti-interference ability is better than the 2.4G mic, Each wireless microphone unit has an unique ID code, Will not be interfered by WIFI signal.Widely applied to conference, speech, Web podcast, YouTube, google, live, Yoga, dancing instructor, Promotion, game, Video, interview, etc. | Packing List and 1year warranty: Bietrun offers1year warranty and free replacement service, If your microphone has no sound, Please contact us or check the user manual. can write to us when you have any questions. You will get: Handheld microphone x1 / wireless receiver x 1 / Microphone anti-rolling protection ring x1/ 6.35 mm to 3.5mm adapter x 1 / USB charging cable x 1/User manual x 1.