CS8573E (USB) 

1. AB/D switch, 4.5 W * 2

 2. Stereo earbuds that come with dual channel mode S type of audio amplifier 

3. chip packaging: ESOP16L 

4. The chip: CS8573E 

5. Supply voltage: 2.7 ~ 6.2 V 

6. The output power: 75 mw