Aerb 4G Waterproof MP3 Music Player for Swimming and other Sports IPX-8 Standard, Black Excellent design with perfect finish and crystal clear sound; be noted this player doesnt support shuffle and iTunes sync (you have to covert iTunes to mp3 or wma format songs); 100% water-resistant to a depth of 3 meters, designed for swimming and other sports activities; built with international IPX-8 standard; Support mp3/wma format songs using USB 2.0 data transfer; Unique clip attaching to swimming and skiing goggles, collar and waist belt friendly; Built-in rechargeable li-polymer battery (3.7V, 200mAh).