Frequency range: 31.5Hz - 8KHz Measuring range: ï¼?28ï¼?30dB - 130dB Frequency Weighting: A/C Microphone: 1/2 inch polarization capacitance microphone Digital Display: 4digit LCD Resolution: 0.1 dB Display Update: 2 times/sec Time Weighting: FAST 125ms SLOW 1 second Measuring ranges: Range 1: ï¼?28ï¼?30dB - 70dB Range 2: 60dB - 100dB Range 3: 90dB - 130dB Accuracy: ±1.5dB (reference conditions 94dB@1kHz) Dynamic range: 40dB Overflow indicator: OVER will be displayed when over range, display OL when overflow the upper range more than 5dB. UNDER will be displayed when under range, display LO when under the lower range more than 5dB or under 28dB. MAX hold: MAX Data storage: 60000 samples Interface: USB interface Power: One 9V battery Power Life: Approximately 70 hours Operation Environment: 0 - 40°Cï¼?32 to 104°Fï¼? 10 - 75%RH Storage Environment: -10 - 50°Cï¼?14 - 122°Fï¼? 10 - 80%RH Dimensions: 185ï¼?Lï¼?*65ï¼?Wï¼?*35ï¼?Hï¼?mm Weight: 155g (including battery) Accessories: 9V battery, instruction manual, USB cable and driver disk