Lose yourself in the music with the Philips SHL3850NC Noise-Cancelling Headphones in stylish black.ActiveShieldActiveShield noise-cancelling technology reduces background noise by up to 97% for an immersive, uninterrupted listening experience.Cancelling out low frequencies using two feed-backward microphones, ActiveShield detects ambient noise and inverts the sound wave to effectively cancel it out for almost silence.ActiveShield can be switched off to let in ambient sound, which can be useful in urban environments to listen out for traffic noise.Finely tunedExperience powerful, precise audio and rich bass thanks to the finely tuned 32 mm neodymium drivers and closed back acoustic system design.Wear for hours in comfort with the pressure-reliving cushions, while the compact folding design and single-sided cable is ideal for travel and storage.Enjoy clear, rich sound with Philips SHL3850NC Noise-Cancelling Headphones.