-Stereo A2DP Bluetooth wireless technology lets you enjoy your music with virtually any Bluetooth-enabled device, such as a computer, smartphone, or tablet including iPhones, iPods, iPads, Android devices, and more -Make phone calls with Bluetooth-equipped mobile phones and smartphones. You can even seamlessly switch between music and calls -Apt-X codec support provides higher-quality audio than standard Bluetooth and allows you to wirelessly listen to Apt-X compatible devices -Sennheiser's active NoiseGard 2.0 noise-cancellation technology improves audio quality and reduces environmental noise by up to 90% so you can focus on your music instead of your surroundings -The TalkThrough function lets you hear your surroundings without having to take off the headphones, ideal for listening to announcements or having a brief conversation -Switchable SRS WOW HD simulated surround sound is built into the headphones for added depth and realism, ideal for enhancing older tracks or poor quality rips -A detachable cable lets you use the headset as a set of standard wired headphones when wireless listening isn't possible. The 3.5mm stereo plug is compatible with CD players, MP3 players, laptops, and more -The folding design, metal-reinforced padded headband, and thick around-ear cushions offer terrific portability, lasting comfort, and excellent noise  isolation -Patented DuoFol diaphragms and neodymium magnets deliver detailed, natural sound with a wide frequency response. There is also a     bass-enhanced normal listening mode, which can be used when NoiseGard is bypassed -The integrated microphone is invisible and out of the way, but provides excellent vocal pickup -Integrated controls for volume, track skip, play/pause, and answer/end call are conveniently built right into the headset and offer tactile "click" feedback -The replaceable battery charges via a USB connection for convenient charging via computer. A multi-country wall adapter with plugs for Europe, the USA,  the UK, and Australia is included for charging with a standard wall socket -A dual-prong airplane adapter is included for use in-flight entertainment systems, while a 1/4" adapter provides compatibility with pro-level audio  devices and home theater systems. A carrying pouch offers convenient storage and portability