1．Material:  RoHS Plastic 

2．Capacity: 500mAh

3．Speaker Power: 3W*1

4．Rated impedance: 8Ω

5．Frequency Response: 20Hz-20KHz

6．S/N ratio: ≥85dB

7．Distortion: <0.1%

8．Sensitivity: -42 ±3dB

9．Weight: 40g

10．Size: 59*Φ45mm

11．Function:

1) 3.5mm audio plug

2) No extra power needed

3) Can be used with any portable audio devices by the stereo jack output