1. Input terminals: DCФ3.5DC Plug 4 

2. Working voltage: 3.7V 

3. Maximum output power: 90MW 

4. Noise level :18db 

5. Signal to noise ratio (SNR): ≥ 90db 

6. Power supply: 600mA  lithium battery 

7. Rated operating time:≥28h 

8. Noise Reduction Type: One-way feedback

9. Speaker diameter: Ф40mm 

10. Speaker Impedance: 32Ω 

11. Speaker frequency response: 20Hz - 20KHz 

12. Speaker sensitivity: 115dB 

13. Wire length: pvc wire, 1.2m