1. Intelligent noise reduction. High-quality digital chip, effective noise reduction, reduce noise damage to the eardrum. 2. Dynamic speaker design. The received sound is processed to make the sound clearer. 3. Simple operation, suitable for all groups of people. 4. Small size, easy to carry. You can take it with you when you go out, and the charging box is designed for easy storage and charging at any time. 5. Suitable for use in a variety of scenarios, with strong adaptability. It can be used in various environments such as daily communication and outdoor activities.<br><br>Average high frequency value:less than equal 120±4dB Full-scale gain:less than equal 38±5dB Frequency response range: 300-3600Hz Total harmonic distortion:less than equal 7%+3% Equivalent input noise level:less than equal 29±3dB Current consumption:less than equal 5mA Charging time: 3h Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Colour:Complexion & Black Material:ABS<br><br>Package Contents: 2 * earphones 1 * charging case 1 * Type-c charging cable<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.