Specifications:Model: TA652A, TA652B (Optional)Material: ABSRange: 30~130dBMeasurement Level: 30~70dB, 60~90dB, 80~110dB, 100~130dBAccuracy: ±1.5dB (sound pressure standard, 94dB@1kHz)Resolution: 0.1dBFrequency Weighting: A/C weighting (TA652A), A/C/Z weighting (TA652B)Time Weighting: FAST: 0.125s, SLOW: 1sSampling Rate: 2 times/sFrequency Response: 31.5Hz~8kHzAnalog Bar: One scale represents 1dBDisplay: 4 digits, max 1999Overload: "OVER, HI" "UNDER, LO"Microphone: High precision 1/2 inch microphoneAmbient Temperature: Range: 0℃~60℃Accuracy: ±2℃Analog Signal Output: AC/DC signal is output from the headphone jack; AC=100mVrms; 2.36Vrms/full scale per rangeDC=10mV/dB (TA652B)USB Connection: No (TA652A), Yes (TA652B)Data Storage: 1999 groupsSynchrous Update: Refer to the PC information for program updateAuto Power Off: 15 mins (can be canceled manually)Working Enviroment: -10℃~50℃, max 80%RH, indoor altitude <2000mStorage Enviroment: -10℃~50℃, max 70%RH (battery removed)Screen Size: 53 x 44mmPower Supply: 3 * 1.5V AA (LR06) batteries (Not included) / USB micro interface 5VItem Size: 229 * 70 * 35mm / 9.01 * 2.75 * 1.37inItem Weight: 215g / 7.58ozPackage Weight: 550g / 19.40ozPackage Size: 29.5 * 10 * 6cm / 11.61 * 3.94 * 2.36inPackage List:1 * Sound Level Meter1 * USB Cable1 * Cloth Bag1 * User Manual (English)