[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 display, easy to read at night. Low radiation, reduce eye damage. [Precise measurement] Measurement 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 130dB. [Power] Powered by one 9V battery (Included) Description of the product Main parameters Frequency weighting: A Measurement range: 30dB-130dB Accuracy within +/- 1.5dB Resolution: 0.1dBA Response time: 0.5 seconds Operating temperature: 0~40C (32~104F) 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 Main functions Data hold function Max / Min display 15 minutes automatic 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 eight hours a day. Your hearing can be damaged if you are continuously exposed to high volume sounds. 20dB: very low, 40dB: soft, 60dB: quite moderate, 85dB: borderline 90dB: Loud, 100dB: Very Loud 110dB: Very Quiet, 120dB: Dangerous Wide Application Some noise is from the graphic shown above: Pet birds / Car noise / Washing machine / Urban construction / Musical instruments This decibel meter is ideal for industry and home. It can easily measure the noise level of household appliances, neighbour's pets, city construction, factories, offices, road cars, etc. Measurement Tips: 1) When you use the device outdoors, please install a windproof ball on the head of the device to prevent the effects of the wind. 2) If you want to measure the sound level from A, you cannot ignore influences from other sources. 3) Please measure several times to get a relatively stable reading. S' please attention: 1) Please take out the 9v battery if not used for a long time. 2) Please do not use it in a high temperature or humidity environment.