PS 202 NC Active Noise Cancelling Earphones with Microphone Active Noise Cancelling Technology: Cancels the low frequency noise (under 1 kHz) by up to 95%. Everplay-X Technology: Allows you to continue calling or listening to your music, if the battery runs out (NC function not available without battery). Music & Calls: The PS 202 NC features an inline remote including a music & call button to allow you to manage your songs (PLAY, PAUSE, REW, FF) and easily answer and end calls. Tangle Free Oval Shaped Cable: The textured cable helps to minimize cable tangling while the special design also helps to reduce cable touch noise. Comfortable Half In-Ear Design: Providing hours of comfortable listening. Enhance your comfort by selecting one of the four sizes of silicon ear tips or Comply foam tips for the perfect fit.