Excellent sound quality, perfect design for karaoke. Bluetooth 4.0 connectivity, convenient to operate. Built-in advanced chip: Reverb chip, audio decoder chip and microphone chip. Use microphone sensor, low noise and high fidelity. Built-in 3.7V 1000mAh lithium battery (up to 5 hours of singing). Aluminum-magnesium alloy metallic appearance, fashionable and beautiful. 5.1 channel supports stereo. Lightweight, easy to carry. You can even lay down your own lyrics and record them by using the included audio recording cable, which let you compare and share your vocal with others.