▽BLUETOOTH WIRELESS KARAOKE MICROPHONE SYSTEM▼: Built-in high sensitivity professional Dynamic microphone, transmission distance upgrade to 98FT (30M), Bluetooth 32FT(10M) ↑Signal stability↑No delay↑No radiation↑Anti-howling↑Anti-jamming ↑Constant frequency↑Distortion <0.2%↑15 UHF Adjustable channels. ↑Only applicable to input devices with MIC interface, 6.35mm (1/4) or 3.5mm(1/8''), not applicable to AUX / Line in Jack. ▽Wireless Microphone System With Echo/Treble/Bass▼ : The wireless karaoke microphone set has Echo, Treble, Bass control button, so you can choose different sound effects according to different songs. This wireless microphone system has Bluetooth function, connect via Bluetooth( Bietrun 09) to play your favorite music.This wireless microphone has 30 channels, each 15, you can switch to the channel that do not have interference. Perfect for Karaoke, Speech, Meeting, Conference, Indoor or Outdoor. ▽BATTERY AND DISPLAY▼ㄩThe receiver of this wireless microphone set built-in 650mAh rechargeable lithium-ion batteries can offer about 6 hours working time and fully charged in 3 hours. The microphone does not come with any batteries, we recommend using 2 AA Amazon alkaline batteries. And our bluetooth microphone has large LED display, you can clealy to see the batteries, channels and singal. ▽PORTABLE and PROFESSIONAL DUAL DYNAMIC MICROPHONE▼: Plug and play, no extra seting. You can Adjust Echo, Treble, Bass, Volume or switch channels on the handheld microphone at will, portable and convenient, eliminating the trouble of carrying the receiving systerm. Comes with dual handheld wireless karaoke microphone, widely applied to conference,speech, Web podcast, Yoga instructor, church, get together, Family party, Opening Ceremony, dancing instructor, Promotion etc. ▽ADVANCED CONNECTION AND AFTER SALES▼: If your microphone has no sound, make sure you have enough power for the microphone and receiver. Insert the MIC jack, Not an AUX/Line in jack. Bietrun offers 1year warranty and free replacement service.Can write to us when you have any questions.We will be the greatest brand in the United States.