Patented Dual Driver Active design: For Lower Ear Pressure Purpose OVC H15 Applied 2 dynamic drivers for music play( 6mm ) , 2 other 13.6mm dynamic drivers for active noise cancelling. It Comes out with noise reduced rate average up to 30dB and when ANC off 4 drivers all can be used for music. 60 Hours Active Working Time: Enhanced rechargeable battery performance. One full charge for 60 hours constant noise cancelling and music enjoyment, 3 or 4 times longer than similar ANC headphones. Built-in Microphone and Remote & Optional Bass: With built-in mic and remote, you can easily change volume, skip tracks. Unique bass enhanced switch meets different listening needs of music enthusiasts. Patented In-ear lock design: Find a suitable Ear Tips will improve NC and music effect, No discomfort after long time wearing or earbuds sliding down. Full fabric design cord makes it lighter and more durable. What You Get: OVC H15 Active Noise Cancelling Headphones, Micro USB Charging Cable, Airline Adapter, 1 Set of Ultra-soft Ear Tips, Travel Pouch, User Manual, 18 Months Warranty and Lifetime Technical Support..