[Sensitive Sensor] 0.5s response time, no contact. Can measure the noise level under any circumstances, quickly display the accurate measurement result. [LCD Display] Large backlit LCD screen, easy to read at night. Low radiation, reduce eye damage. [Accurate Measurement] Measuring range 30 ~ 130dBA; Accuracy of +/- 1.5dB with 0.1dB resolution [Multi-function] Data hold function; Max / Min sound level measurement; The 15-minute auto power-off also has an alarm function when the voice level reaches 130 dB.  Product Description  Sound Level Meter Main Parameters Frequency Weighting: A Measuring Range: 30dB-130dB Accuracy within +/- 1.5dB Resolution: 0.1dBA Response Time: 0.5 seconds Operating Temperature: 0 ~ 40 ° C (32 ~ 104 ° F) Operating Humidity: 10 ~ 90% RH Storage Temperature: -10 ~ 60 C (14 ~ 140 F) Storage humidity: 10 ~ 70% relative humidity Dimensions: approx. 170 (L) x 58 (W) x 35 (H) mm (6.7 x 2.3 x 1.4 inches Weight: Approx. 107 g Power Supply: One 9V Battery (Batteries not included) Main Functions Data Hold Function Max/Min Display 15 Minutes Auto Power Off Large LCD Display Package Contents: 1x Digital Sound Level Meter How Loud is Too Loud? Government research suggests that the safe exposure limit is 85 decibels for eight hours a day. Your hearing can be damaged if you are continually exposed to high-volume sounds. 20dB: Very Low, 40dB: Soft, 60dB: Fairly Moderate, 85dB: Limit 90dB: Loud, 100dB: Very Loud 110dB: Very Low, 120dB: Dangerous Wide Application Some noises come from the above graph: Pet Birds / Car Noise / Washing Machine / City Construction / Musical Instruments This decibel meter is ideal for industry and home use. It can easily measure the noise level of household appliances, neighbor's pets, city construction, factories, offices, road cars, etc. Measuring Tips: 1) When using the device outdoors, please install a wind-resistant ball on the head of the device to avoid the effects of wind. 2) If you want to measure the sound level from A, you cannot ignore the influences of other sources. 3) Please measure several times to get a relatively stable reading. Please attention: 1) Please remove the 9v battery if it is not used for a long time. 2) Please do not use it in a high temperature or humidity environment.