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Description:features: 1) Digital formats supported: MP3 / WAV / WMA 2) PC interface supported: USB2.0 3) Maximum input power rating: 5V DC, 150mA 4) Voice output power: 55mW 5) Earphone output power: 5mW 6) Memory flash: 128MB / 256MB / 512MB / 1GB 7) Music playing time: 6 hours 8) Charging time: 3 hours 9) System requirement: Windows XP, Windows 2000, Windows Me, Windows 98SE