Phiaton PS 300 NC Premium Noise Cancelling Headphones with Fold-N-Go Design (Discontinued by Manufacturer) Phiaton's noise cancelling headphones effectively reduce unwanted noise in everyday environments by up to 90% Phiaton's patented VHSound Technology controls airflow system to provide a "concert hall" sound quality experience Mute button allows you to talk while wearing headphones / Bass control switch for listener's preference Flexible 'fold and go' design comes with Compact carrying case for easy travel Two rechargeable lithium-polymer batteries and cradle charger with USB cable included