[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. [Accurate Measurement] Measuring range 30~130dBA; Accuracy of +/- 1.5dB with 0.1dB resolution [Multi-function] Data hold function; Max/Min sound level measurement; 15 minutes auto shut-off also has alarm function when the voice level reaches 130dB. [Power Supply] Powered by 9V battery (included)