1,BACKLIT LCD SCREEN: Equipped with a backlit LCD screen, this digital noise tester is very convenient to use in dark or low light environments, ensuring easy readability at all times. 2,HIGH ACCURACY MICROPHONE: Featuring a 1/2 inch capacitive microphone, this sound level meter boasts high accuracy, sensitivity, and rapid instantaneous response for accurate noise measurements. 3,VISUAL AND AUDIBLE ALARM: When the measured noise level exceeds or falls below the set thresholds, the screen background turns red, and the measurement value flashes to provide visual and audible alarm cues. 4,AUTO POWER OFF: The sound meter automatically shuts off after 5 minutes of no operation, conserving battery life for longer usage. 5,VERSATILE APPLICATIONS: Mainly used for environmental monitoring in residential areas, construction sites, factories, restaurants, entertainment venues, and various other settings. 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.