Features 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. 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. 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. VERSATILE APPLICATIONS: Mainly used for environmental monitoring in residential areas, construction sites, factories, restaurants, entertainment venues, and various other settings. AUTO POWER OFF: The sound meter automatically shuts off after 5 minutes of no operation, conserving battery life for longer usage. Specification:Item Type: Decibel Meter Material: ABS Model: NF 562 Noise Measurement Range: 30 to 130dB Noise Measurement Accuracy: ±1.5dB Noise Measurement Resolution: 0.1dB Sensor: Capacitive Microphone Sampling Rate (FAST): 125ms Sampling Rate (SLOW): 1s Display: HD LCD Automatic Shutdown: 5 Minute Automatic Shutdown Without Operation LCD Backlit: Yes Battery: AAA x 3 (Shipped Without Battery) Package List:1 x Decibel Meter1 x Instructions Package List 1 x Decibel Meter 1 x Instructions