【Wireless microphone system with echo/treble/bass】:● The wireless karaoke microphone set has echo, treble, bass control button, you can use different sound effects according to different songs. ●The system has bluetooth, connect via bluetooth( bietrun) to play your favorite music.●The wireless mics have 30 channels, each 15. Remove the battery cover of the mic, short press the grey circle button to adjust channel to avoid interference. For karaoke, speech, meeting, conference, indoor, outdoor. [Professional UHF Wireless Karaoke Microphone System] The microphones adopt fcc certified UHF frequency band, which provide the long transmission distance (Open Place: UHF distance 98ft/30m, Bluetooth 32ft/10m).●Frequency Response 50Hz-16kHz●Signal stability ●No delay ●No radiation ●Anti-howling ●Anti-jamming ●Constant frequency ●distortion

1. Use UHF technology, give you clearer sound quality, signal stability, no delay, anti-howling, anti-jamming. 2. Working range : UHF up to 160 ft, Bluetooth range is 10 m 3. Operate all function on the handhold microphone 4. Bluetooth 4.2 available, search the Bluetooth "Bietrun 08" in the Bluetooth device list and connect it. 5. 15 sets working together: 30 microphones max 6. High quality sound : ECHO, reverberation regulation 10 Levels TREBLE , high pitch adjustment, 8 Levels BASS, Bass adjust, 8 Levels 7. Volume Adjustable: 5 levels total 8. High Quality Material: alloy casing, steel meshed microphone head 9. Large LCD Display: power, signal, frequency, channel statues display