[Sensitive sensor] 0.5s response time, no contact required. Can measure noise levels in various conditions and quickly display accurate measurement results. [LCD display] Large backlit LCD screen, easy to read in low light. Low radiation design helps reduce eye strain. [Precise measurement] Measuring range: 30 to 130 dBA; Accuracy of +/- 1.5 dB with a resolution of 0.1 dB. [Multi-function] Data hold function; Max/Min sound level measurement; 15-minute auto power-off; Alarm function activates when sound level reaches 130 dB. [Power supply] Powered by a 9V battery (included). Sound level meter Main parameters Frequency weighting: A Measuring range: 30 dB 130 dB Accuracy: within +/- 1.5 dB Resolution: 0.1 dBA Response time: 0.5 second Operating temperature: 0 C to 40 C (32 F to 104 F) Operating humidity: 10% to 90% R.H. Storage temperature: -10 C to 60 C (14 F to 140 F) Storage humidity: 10% to 70% relative humidity Dimensions: approx. 170 mm (L) x 58 mm (W) x 35 mm (H) (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-minute automatic shut-off Large LCD screen Package content: 1 x digital sound level meter 1 x 9V battery How strong is too strong? Government research suggests that the safe exposure limit is 85 decibels for eight hours per day. Hearing can be damaged by continuous exposure to high-volume sounds. 20 dB: very low 40 dB: soft 60 dB: fairly moderate 85 dB: recommended daily limit 90 dB: loud 100 dB: very loud 110 dB: extremely loud 120 dB: potentially dangerous Wide application This decibel meter is suitable for industrial and home use. It can measure noise levels from household appliances, neighbor's pets, urban construction, factories, offices, road traffic, and musical instruments. Measuring tips: 1) When using the device outdoors, install a windscreen on the microphone to minimize wind interference. 2) To measure sound from a specific source, try to minimize interference from other noise sources. 3) Take multiple measurements to obtain a stable reading. Please note: 1) Remove the 9V battery if the device will not be used for an extended period. 2) Avoid using the device in environments with high temperature or humidity.