The Bluetooth Sport In-Ear MP3 Player is not only a MP3 player but also a Bluetooth Headset. Built-in a MicroSD memory card slot, let you can insert your memory card with your favorite music. If you are listening the MP3 music, your mobile phone rings up simultaneously. The Bluetooth Sport In-Ear MP3 Player to let you can talk with your friends. After you finished the call, it will be returned to its original play. Convenient to use.