Specifications:

1. Category: Active noise canceling headphones

2. Input terminals: DC 3.5DC Plug 4

3. Working voltage: 3.7V

4. Maximum output power: 90MW

5. Noise level: 18-20db

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

7. Power supply: 120mA lithium battery

8. Rated operating time: ≥18h 

9. Noise reduction modes: dual-microphone noise feedback

10. Speaker diameter: 40mm

11. Speaker Impedance: 32Ω

12. Speaker frequency response: 20Hz - 20KHz

13. Speaker sensitivity: 115dB

14. Noise level: ≤-78dBA

15. Dynamic range: ≥ 78 dBA

16. Distortion THD: ≤ 0.1%

17. Stereo crosstalk: ≤ -52 dBA

18. Wire length: pvc wire, 1.5m

Features:

1. Built-in noise reduction circuit inverting precision ANC, it can effectively cut off 85% of the background noise.

2. Dedicated high-quality noise-style 40mm diameter driver unit, to ensure the highest quality.

3. 3.7v lithium ion battery, it was recharged without replacing batteries.

4. Two modes of operation, to choose noise reduction state (subject to a battery), the normal state (without battery), it was easy to switch.

5. Earmuffs imported sponge, soft and comfortable, long wear without fatigue.