Fangrui Product Details 1. Tasi Ta650a Decibel Detector House Volume Tester Noise Meter 2. Measuring Range: 30db - 130db 3. Resolution: 0.1db 4. Accuracy: About 1.5db (based On Standard Sound Source, 94db@1khz) 5. Sampling Rate: 2 Times Sec 6. Time Weighting: Fast 0.125s, Slow 1s 7. Frequency Response: 31.5hz - 8khz 8. Noise Display: 4 Digits, Up To 1999 9. Microphone: High Sensitivity 12 Inch Condenser Microphone 10. Auto Shutdown: 15min (can Be Manually Shut Down) 11. Operating Environment: -10 - 50 Degrees Celsius, Relative Humidity, Indoor Altitude Less Than 2000m 12. Storage Environment: -10 - 50 Degrees Celsius, Within Relative Humidity (remove The Battery) 13. Power Supply: 2 X 1.5v Aaa (r03lr03) Batteries (not Included) 14. Display Size: About 3.4 X 3.1cm 15. Dimensions: About 16.7 X 5.9 X 3.1cm 16. Weight: About 114g 17. Features: 18. High-sensitivity 12-inch Condenser Microphone, High Precision, High Sensitivity, Instantaneous Response 19. With Low Voltage Display 20. Large Hd Display With White Backlighting 21. 15 Minutes Without Operation After The Automatic Shutdown (can Be Canceled Manually) 22. Large Range 23. Packing List: 24. - Main Unit X 1 25. - Cloth Bag X 1 26. - Instruction Manual X 1