huawei freebuds pro 4 Clean and has no issues • Exceptional Sound Quality (Lossless Audio): The first earbuds to support lossless audio transmission at speeds up to 2.3 Mbps and 24-bit/48 kHz resolution, thanks to Huawei's exclusive L2HC 4.0 codec and Polar Code technology. It also holds HWA and Hi-Res certifications to ensure sound purity. • Smart Dynamic Noise Cancellation (ANC): The earbuds are equipped with new three-layer memory foam earcups, which enhance ambient noise isolation by up to 30% compared to previous versions. • Head Motion Controls: The earbuds offer an innovative feature to answer or reject incoming calls hands-free, simply by nodding your head (e.g., nodding to accept or shaking to reject). • Clear and Crisp Calls: Supports AI call noise cancellation, which keeps your voice clear and pure even in strong winds up to 10 m/s, or in crowded and noisy places. • Design (Silver String Design): The outer casing is inspired by the classic elegance of string instruments, with a laser-engraved handle, a smooth ceramic texture, and attractive aesthetic touches. • Connect to Two Devices Simultaneously: The earbuds support pairing and connecting to two devices at the same time and switching between them seamlessly, whether the devices are running iOS, Android, or Windows. • Battery Life: Provides a long battery life of up to approximately 33 hours with the charging case.