1, its internal amplifier circuit, in the charging moment, in a state of rest, in order to improve the charging speed;
2, such a state, there are some of these audio products, you can manually open the amplifier circuit of the power switch, the audio equipment can work normally;
3, small, mini rechargeable audio equipment, such as bluetooth speakers, usb small speaker Such equipment, can support charging, playback of both working conditions. Larger volume of the type of square dance use, rechargeable audio equipment, mostly for charging, the amplifier circuit is set to automatically hibernate. But it can also manually open the amplifier circuit, emergency use. That is, the charging side of the working state. When working, the power light is on.