[Sensitive sensor] 0.5s response time, no contact. Under any circumstances, the noise level can be measured, and the accurate measurement results can be displayed quickly. [LCD display] Large and clear LCD backlit display, easy to read ENEN at night. Low radiation, reduce damage to the eyes. [Accurate measurement] Measurement range 30 - 130dba 1.5db accuracy, resolution is 0.1DB. [Multi -function] Data saving function maximum or minute sound level measurement 15 minutes automatic power shutdown, when the voice level is as high as 130DB, it also has alarm function. Response time: 0.5 seconds Work temperature: 0 - 40 ° C (32 - 104˚F) Operation humidity: 10 - 90 percent R.H. Storage temperature: -10 - 60 ° C (14 - 140 ° F) Storage humidity: 10 - 70 percent R.H. Size: about 170 (L) x 58 (W) x 35 (H) mm (6.7 x 2.3 x 1.4 inches) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.