1. Sound Level Meter: Measurement range from 30 to 130 dB with an accuracy of ± 1.5 dB and a frequency range from 31.5 Hz to 8.5 KHz. 2. Large Screen: Our digital sound level meters are equipped with a 9.6-inch high-definition backlit LCD screen, allowing you to easily read them at your convenience throughout the day. 3. Wall Mountable: Sound level meter with mounting holes on the back, easy to install, widely used in homes, offices, hospital wards, hotels, laboratories and other places. 4. Alarm: The indicator light flashes when the alarm is activated, accompanied by a beeping sound, and the alarm time and sound are adjustable. 5. Alarm Bell: Short press the horn button to turn off the alarm bell, the red light goes out, then short press the horn button to turn on the alarm bell, the red light is on. Item Type: Wall Mounted Decibel Meter Material: ABS Measurement Range: 30-130dB Accuracy: ±1.5dB (based on a standard sound source, 94dB at 1KHz) Frequency Response: 31.5Hz-8.5KHz Frequency Weighting: A-weighting Response Time: FAST Microphone: 6mm condenser microphone Digital Display: 3 digits Resolution: 0.1dB (<100dB) 1dB (>100dB) Alarm: Support Alarm Output: Support Storage Function: Not supported PC Communication: Not supported Display: 9.6 inches Power Supply: MicroUSB interface DC5V 1A Operating Temperature and Humidity: 0-40℃, 10%-80%RH Storage Temperature and Humidity: -10-60℃, 10%-70%RH