Features: 1. Automatic backlight display for easy visibility in dark situations.Maximum/minimum hold feature for measuring absolute high/low peaks. 2. The back of the product is provided with a stable bracket for measuring and easy placement. 3. It is lightweight, compact, ergonomic, user-friendly and ideal for monitoring noise levels. 4. When the battery power is not sufficient, there would be a sign in the LCD indicating to ensure the long service life. 5. Widely used for environmental noise detection and prevention of audio products, building construction, offices, factories, traffic roads, habitable rooms, entertainment sites,etc. Specification: Item Type: Noise Tester Material: Plastic Model: TA8151 Sensor: 1/2 inch capacitive microphone Measuring Range: 30-130db Measurement Aaccuracy: ± 1.5db Frequency Response: 31.5Hz-8KHz Frequency Range: A Value Remains: Support Maximum/Minimum: Support Resolution: 4 digits Resolution Ratio: 0.1dB Dynamic Feature Selection: Fast/Slow Backlight: Support Sampling Rate: 2 times /S Battery: 2 x AAA Battery (Not Included) Package List: 1 x Noise Tester 1 x Cloth Bag 1 x Instruction . Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.