Product parameters Product model: MS-B2 Features: Microphone, High fidelity audio quality, Wired/wireless dual mode, Ultra long battery life, Multi axis folding, Noise reduction, Clear call Bluetooth version: V5.1 Connection distance: 15 meters (no interference) Interface: Type-C Battery capacity: 400mAh Call usage time: approximately 12 hours Music time: approximately 14 hours Speaker: 32/40mm Product color: Black/White/Beige/Deep blue/Coral red/Green Earphone size: 185 * 76 * 197mm High definition call. Optimize call noise reduction, as if communicating face-to-face, clear and not harmful to the ear. Good sounds can be heard in different scenes. Reading and learning, fully enclosed earmuffs, physical noise reduction, immersing oneself in the music world Entertainment and leisure, full line decoder, ultra-low latency, audio and video synchronization Business office, foldable microphone, adjustable from multiple angles, for clearer calls Flexible folding and storage, dual axis rotating folding does not take up space, making it easy to carry during travel Soft protein leather earmuffs, Mild touch and comfortable to wear. 15 tilt design for a secure fit. Equipped with a retractable frame, suitable for wearing with different head shapes Ultra long battery life, equipped with a large capacity rechargeable lithium battery, can be used for a week on a single charge, and the music never stops Wired+wireless dual mode, meeting the needs of different usage scenarios. Bluetooth 5.1 and wired audio dual selection, low latency, supports various devices such as switches, phones, laptops, PCs, tablets, PS4/XBOX Large speaker size, 40mm audio unit, with almost original sound quality, the music is more textured and layered. Button operation, simple, convenient, and fast. Packing list Earphones 1 Audio cable 1 Type-C power cord 1 User manual 1