This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90-day limited hardware warranty. Smart Listening automatically detects your activity, whether you're travelling in an airport or sitting in a quiet area, then balances the noise cancelling levels accordingly. You can customize your preferences with the Sony I Headphones Connect App. Leave your headphones on: Place your hand over the right ear cup to turn the volume down for instant conversation.Change the track, turn the volume up or down, and take or make calls by tapping or swiping the panel with your fingertip.