1).Bluetooth version: 4.1 with BK chip. 

2).Material: ABS+Silicone.

3).Output power: 4Ω40MM 4W* 2.   

4).Working range: 10M Without obstacles.

5).Built-in battery: 600mAh (3.5 Hours battery Life).

6).Size: L182.6mm*W40mm*H66 mm.

7).Weight: 200g.

8).Certificate: CE,FCC,ROHS,MSDS,UN38.3.