Feature: 1. LCD DISPLAY: Portable noise meter, LCD display with backlight function, you can clearly view the readings even in a dark environment. 2. HIGH SENSITIVITY: Built in 1/2 inch polarized capacitive sensor, 31.5Hz‑8KHz frequency response, stable and efficient, providing fast and accurate measurement. 3. HIGH RESOLUTION: The measurement range is 30dB‑130dB, the resolution is 0.1dB, high accuracy, suitable for measuring the sound quality of the environment. 4. MULTIFUNCTION: Mini sound level meter, powerful, supports data retention, maximum and minimum measurement functions, compact and easy to carry. 5. WIDE RANGE OF USES: This noise meter is very suitable for use in cars, rooms, theaters, home appliances, factories, schools, buildings and other occasion. Specification: Item Type: Sound Level Meter Material: ABS Model: DT-815 Battery: 6F22 9V x 1 Battery (Battery Not Included) Purpose: Sound Level Measurement Display: LCD Display Range Low Frequency Band 30dB-80dB Mid Band 50dB-100dB High Band 80dB-130dB Auto Band 30dB-130dB Resolution 0.1DB Error At 94dB, ±1.4dB 1kHz sine waves Sensor 1/2 inch polarized capacitive sensor Frequency Response 31.5Hz-8KHz Frequency Weighting Characteristics A and C Time Weighting 125 milliseconds fast, 1 second slow Data Retention √ Maximum Minimum √ Data Retention 50 . Package List: 1 x Sound Level Meter (Battery Not Included)1 x Storage Box1 x Manual Note: Keep away from open flames.