Listen to your music in the gym, on the go, or underwater with the Sony NWZ-WS613 4GB MP3 Player Headphones. This MP3 player features Bluetooth 4.0 for wirelessly streaming from your Android or iOS device. Alternatively, you can store up to 4GB of music on the player’s internal memory. For added convenience, you can play, pause, adjust volume, and more with the included ring-style remote control.