Enjoy rich, detailed sound with enhanced bass response without inconvenient cables and cords (ear pieces are connected by a stylish flat cable for tangle free use). Earbuds attach magnetically for added portability. Bluetooth 4.0 wireless capability offers lower energy consumption and lets you listen to audio from your mobile device from up to 30 feet away, while our custom fit ear cushions make extended listening a pleasure. Built-in echo-cancelling mic allows you to have wireless phone calls and an in-line remote control puts track control, play/pause, answer/end calls and volume control within easy reach. The rechargeable lithium-ion battery provides 4 hours of continuous audio (music playback or phone). Includes USB charging cable.