... )Colors: black,sliver,pink,purple,blue,green,red7)Built chargeable lithium battery8)Driver free for windows 2000or above9)Dimension: 28*41 ... ~7HoursLCD DisplayN/ASNR>85dBFrequency Response Range20HZ~20KHZ Physical characteristicsBattery TypeRechargeable lithium-ion polymer batteryStorage Temp*-20 ~ +55Ambient Temp*-10 ~ +55Operation Relative Humidity ...