REMAX Wireless Bluetooth Sport Earphone V4.1 in-ear Neckband Earbud with Microphone Noise Cancelling Headphone for Mobile Phone Music is a catalyst for movement According to the sound structure of the careful debugging, filter out the human ear fatigue noise and be amended, High and low frequency distribution, The transition of the band is naturally smooth,comfortable and no burr, whether listening to music or call are more clear. Feature: A.Headset summary: 1. Phone function: answer / hang up / refute / callback. 2. Three-way calling. 3. neckband&in-ear style. 4. neckband style charging port by magnetic bar design, improve the ear hook To prevent the pull, and fall down, resulting in some damage to the ears and pain. B.Sports headphones: for your sport, gym, running, mountain climbing, riding more dynamic, power and passion, wireless control and wear to add your convenience and fashion. For the movement came into being, let the sweat more fierce.