Professional tuning button. Pitch / bass/volume/accompany/reverberation all can be adjusted via this microphone bluetooth wireless microphone and speaker 2 in 1, can work independently without extra connection microphone head has three times noise reduction handle, more efficient to highlight your beautiful voice 2600mah battery for up to 8 hours of singing, enjoy ktv karaoke effects with the smartphone app compatibility, fit for ios and android smartphone ipad tablet, can read usb card, bluetooth connection style: handheld microphone come amplifier speaker communication: wireless use: karaoke microphone wireless: bluetooth 4.0speaker driver: 3w battery: li-polymer 3.7v/2600mah working time: 8 hours material: aluminum abs size: 9.45x2.85 inch package: 1x audio line 1x charging cable 1x product manual.