... on manual:english,chinese,japanese,korean,France,German,Italian9.Rechargeable lithium battery through USB/AC charger System RequirementsHardwareIBM PC or compatible PC ... ~7HoursLCD DisplayN/ASNR>85dBFrequency Response Range20HZ~20KHZ Physical characteristicsBattery TypeRechargeable lithium-ion polymer batteryStorage Temp*-20 ~ +55Ambient Temp*-10 ~ +55Operation Relative ...