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; 15 minutes auto power off also has alarm function when the voice level reaches 130dB. Power Supply: Powered by 9V battery (Included) Frequency Weighting: A Measuring Range: 30dB-130dB Accuracy within +/- 1.5dB Resolution: 0.1dBA Response Time: 0.5 second 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% RH Dimensions: Approx. 170 (L) x 58 (W) x 35 (H) mm (6.7 x 2.3 x 1.4 in) Weight: Approx. 107g Power supply: One 9V battery Main functions Data hold function Max/Min display 15 minutes auto power off Large LCD display Package contents: 1x Digital Sound Level Meter 1x 9V battery 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 soft, 40dB: Soft, 60dB: Fairly moderate, 85dB: Limit 90dB: Loud, 100dB: Very loud 110dB: Very soft, 120dB: Dangerous 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 meter outdoors, please install a wind-resistant ball on the meter head 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 high temperature or humidity environment. Number of products: 1 piece Color: yellow black Size: 170*58*35(mm)