MARSEE MSH04 Bluetooth Headphones Wireless Back Head In-Ear Sports Earphones with CSR Bluetooth 4.1, Stereo Pure Sound, 8 Hours Play Time Advanced Bluetooth 4.1 :The MSH04 packs the latest and most advanced Bluetooth 4.1 wireless audio technology, A2DP stereo audio codecs, and Multipoint functionality for managing calls and media from two different Bluetooth devices simultaneously CVC 6.0 : Coupled with 6th generation CVC, you will never miss a beat and enjoy a crystal clear voice talking