Our sport headset adopt advanced Wireless V4.2 with multi-point technology, simultaneously connect with 2 mobile devices, high-sensitive inbuilt mic with noise canceling technology, deliver crystal clear stereo sound with transmission range up to 32.8ft without barrier. Inbuilt 220mAh rechargeable battery and equipped with USB charging cable, 9Hrs unstoppable HD sound music or 15Hrs continuous call while only 3Hrs fully be charged. Multi-functions can be achieved via pressing MFB (Multiple Funct