?Built-in 2600mAh Rechargeable Battery? for up to 8 -15 hours of speaking, singing ,recording or playing Music.(according the volume) ?multiprotect safety battery?keep you and your devices safely with surge protection, short circuit prevention and more advanced safety features ?6w*2 Speaker& Amplifier? louder and stronger sound than other similar sellers ?Bluetooth 4.2 connection?Not only reduces the standby consumption of the mic, but also enhancing the transmission distance and stability ?Higher sound quality? 1.Built-in 60*40 mm Low-frequency Radiator (Bass Diaphragm) make the sound quality improved by 30% and give you the stronger shock and heavier sense. 2.the highest quality chipset with four channel stereo fucntion, Intelligent three times noise reduction mic head . 3. the built-in pop filter helps reduce p and s pop sounds ?Support TF Card ? Support micro TF card (NOT INCLUDE) play and song switch. You can play music and sing without smartphone ?Two way Connection? 3.5mm audio jack and Bluetooth Connection, it can connect with Android, ios phone,iPad, tablet,ect.. Once turn on the singing software on your phone or on your computer,it will produce excellent sound quality with reverberation.