Features: True wireless noise reduction earphone: the earphone is designed with a customized acoustic platform, and the small in ear shape produces strong sound effect. Excellent sound quality: the fully customized acoustic platform is adopted, and the compact body emits strong and balanced sound effects. Active noise reduction: the active noise reduction function adopts a precisely adjusted filter, which can be dynamically adjusted according to the surrounding environment. Transparent mode: open the transparent mode with one key, and the ambient sound will naturally enter the ear without obstruction. 13mm moving-coil unit: three dimensional sound quality, three-dimensional sense of machine space, open sound field, clear and balanced music performance, thick and powerful low frequency. Specifications: Battery: Headset capacity 35mah, charging box 300mAh Time: 4-5 hours Size:1.18*0.79*0.12inches