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Measuring Range: 30~130dBA 35~130dBC Accuracy: ±1.5dB Frequency Range: 31.5Hz-8.5kHz Linearity Range: 50dB AC/DC Output: √ Auto Power Shut Off: √ Low Battery Indication: √ Over Range Indication: √ Max Hold Function: √ USB PC Interface: √ Calendar function: √ Digit & Resolution: 4 Digits & 0.1dB Time Weighting Selection: Fast/Slow Microphone:1/2 Inch Electret Condenser Microphone Memory: 512M Frequency Weighting: A & C Sampling Frequency :2 times/sec LCD size: 30x50mm Product Color: Ivory Product Net Weight: 350g(include battery) Product Size: 235x70x30mm Power: 9V (Alkaline or DC Adapter) Operating Temperature and Humidity: 0℃ to 40℃ (32 to 104℉) 0 to 70% RH. http://power-is.blogspot.com/