Mutant MIG-BTH4 M-Rockz Bluetooth Wireless Stereo Headphones with Microphone, Black Connection : Wireless Bluetooth A2DP EDR 2.1 supports music and hands-free calling. Advanced DSP technology for interference free connection with up to 10 meter range. Great Sound Quality : Echo cancellation and noise reduction brings out the clarity in the sound. Full range dynamic drivers deliver life-like music with crystal clear details (40Hz-20KHz) Music controls built in for skip, fast forward, rewind, play/pause and volume. Answer calls by pressing play/pause! Built in rechargeable battery powers 14 hours of call time and 11 hours of music playback. Charges via USB in 3.5 hours. USB cable included! Built in microphone for hands-free conversations. Foldable design for easy travel. Free travel bag included!