Supershop&reg; 4GB Swimming Diving Water Waterproof MP3 Player FM Radio Earphone Red International Standard IPX8 Waterproof MP3/WMA Supported.Humidity: 20% ~ 100% Battery life: Playing continously for 7-8hours(depending on user`s operation habits) Firmware updating, file transmission and storage,and battery recharge via USB Operation temperature under water: 0 to 50 degrees C