Premium Wireless Active Noise Cancelling Headphones.PSB’s award-winning wireless active noise cancelling headphones are reborn as the M4U8 MKII with exciting feature upgrades. Enhanced battery life and the latest noise cancelling technology will improve mobile listening, while Audiodo Personal Sound will compensate for your unique hearing abilities, letting you fully experience PSB Speakers’ renowned sonic signature. Work or play, PSB Speakers’ headphones are designed for comfortable and noise-free extended listening.High-performance wireless n