[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)< /p>Frequency weighting: AMeasurement range: 30dB-130dBAccuracy within +/- 1.5dBResolution: 0.1dBA< /p>Response time: 0.5 secondsOperating temperature: 0~40C (32~104F)Operating humidity: 10~90% RHStorage Temperature: -10~60 C (14~140 F)Storage Humidity: 10~70% RHDimensions : approx. 170 (L) x 58 (W) x 35 (H) mm (6.7 x 2.3 x 1.4 inches)Weight: approx. 107 gPower supply: one 9V batteryMain functionsData hold functionDisplay Max / Min15 minutes auto power offLarge LCD displayPackage Contents:1x digital sound level meter1x 9V batteryHow loud is too loud?Research government suggest that the safe exposure limit is 85 decibels eight hours a day. Your hearing may be damaged if you are continuously exposed to high volume sounds.20dB: very quiet, 40dB: soft,60dB: quite moderate, 85dB: borderline90dB: Loud, 100dB: Very loud110dB: very low, 120dB: dangerousThis decibel meter is ideal for industry and the 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 using the device outdoors, please install a windproof ball on the head of the device to prevent the effects of wind.< p>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.Please attention:1) Please take out the 9v battery if not in use for a long time.2) Please do not use it in high temperature or humidity environment .Number of products: 1 pieceColor: black yellowSize: 170*58*35(mm)