H501 Active Noise Cancelling Stereo Headphones, Over-ear Headphones with Inline Microphone and Volume Control, ANC Battery Time -50 hours (Wired / Metal Black) Active Noise Cancelling Headphones - H501 reduces unwanted low-frequency noise by 92%, allowing you to sleep soundly like a baby even in a noisy vehicle such as an airliner Impressive Sound Quality - rich bass and well balanced sound with clear details, H501 stereo headphones deliver the immersive listening experience for you Complete Over Ear Style for Lasting Comfort - the rotating ear cups along with the adjustable headband also ensure a good fit for almost any sized head 50 Hours Battery Life - enable you to enjoy the sound for a long time. Removable battery also makes it easy to replace without waiting for charging Free Your Hands When Make and Take Calls with Inline Microphone (IMPORTANT NOTE: 3.5mm detachable MIC cable is made for iPod iPhone iPad. Inline microphone compatibles with both iOS and Android devices. BUT remote control ONLY compatibles with iOS devices)