The M4U 8 allows you to listen to music wirelessly with aptX HD—the latest Bluetooth technology that lets you stream 24-bit music over a wireless connection to deliver a ‘better-than-CD’ listening experience. Created to give listeners a clear, natural sounding headphone, the M4U 8’s RoomFeel technology adds layers of lush realism to all your favorite music, while also utilizing a sophisticated active noise-cancelling technology that uses four adaptive microphones to block out noise.