The PS 202 NC In-Ear Headphones with Microphone introduce advanced levels of clarity across the frequency spectrum. With the technology power of active noise cancellation to further immerse you in your music, you'll be able to take some time to listen to music and relax. Enabled by Phiaton's powerful noise-canceling technology, PS 202 NC actively reduces low frequency ambient noise (under 1 kHz) by up to 95% while packing more richness and pleasing nuances into the sound delivery.