[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) 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% RH 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 Display Max / Min 15 minutes auto power off Large LCD display Package Contents: 1x digital sound level meter 1x 9V battery How loud is too loud? Research suggests 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: borderline 90dB: Loud, 100dB: Very loud 110dB: very low, 120dB: dangerous This decibel meter is ideal for industry and the home. It can easily measure the noise level of household appliances, neighbor'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. 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 piece Color: black yellow Size: 170*58*35(mm)