Walsoon WS442204 Waterproof Underwater 4GB MP3 Music Player Swimming + FM Radio (Black) USB rechargeable battery,USB plug & play,With FM radio function. Waterproof MP3 player is tailored for swimmers and water sports enthusiasts. The waterproof earphone attaches to the player via a special screw-in jack to keep the device water-tight. The waterproof earphone employs a special non-woven fabric membrane to keep the speaker vibration plate dry while maintaining a high quality sound output. Waterproof MP3 player can be widely approachable for all sporting activities under different environments. Both the waterproof earphone and the waterproof MP3 player are tested to comply with international water resistant standard.