Luxury Headset Retractable Earbuds Neckband Sport Waterproof Headphones Wireless Stereo Earphones with Mic For Smart Phones,Bluetooth 4.1 and apt - x audio decoding technology + cvc6.0 noise cancellation make stable and high fidelity natural stereo and super audio performance. 32ohm high output drive, 10mm speaker provides powerful HD quality sound, deep bass and crystal clear trebleA button controls the retractable wire (press the retract button to pull the wire to better protect the wire, rather than pulling the wire directly).