CMF BUDS Wireless Earbuds Sound Quality and Basic Specifications Sound Quality: Offers clear and pure sound with excellent bass enhancement (Ultra Bass Technology), 12.4mm drivers, and sound calibration by Dirac. Noise Cancellation (ANC): Supports Active Noise Cancellation up to 42dB, along with a Transparency Mode to hear your surroundings. Battery: Provides up to 8 hours of playback on a single charge, and a total of up to 35.5 hours with the charging case. Calls: Equipped with 4 precision microphones with background noise reduction technology during calls. Resistance and Design: IP54 water and dust resistant, featuring a sleek and modern design with a circular locking ring on the case.