[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 damage to eyes. [Accurate measurement] Measuring range 30 ~ 130dBA; Accuracy of +/- 1.5dB with a resolution of 0.1dB [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 9V battery (Included) Weighting frequency: 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% R.H. 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 inch) Weight: approx. 107g Power supply: one 9V battery Note: this does not include other things, the color is based on the first picture, and the other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!