Professional adjustment buttons Treble / Bass / Volume / Father / Reverb can be adjusted by the microphone. Bluetooth wireless microphone and speakers, two-in-one, no additional connection to work independently. 1800mAh battery up to 6 hours of singing, enjoy the smart phone APP KTV karaoke effect. Compatibility, suitable for iOS and Android smart phones, iPad tablet PCs, Bluetooth and so on. Multi-purpose: Bluetooth speakers, karaoke singing, car audio, music recording, podcasts and so on.