Guaranteed to stay on with a first-to-market interchangeable ear lock system, the Run Free Pro is an all-new Bluetooth v4.0 wireless earphones engineered to please individuals on the go! The Run Free Pro also comes with fast speed auto pairing and wind noise reduction. The sporty yet fashionable waterproof body ensures you to look and feel great while enjoying SOUL"s signature sound with up to 8 hours playtime.