Feature: 1. Decibel Meter: Measurement range of 30 to 130dB with an accuracy of ±1.5dB and frequency response range of 31.5Hz ‑ 8.5KHz. 2. Large Screen: Our digital sound level meters are equipped with a high definition backlit 9.6in LCD screen, allowing you to easily read them at your convenience throughout the day. 3. Wall Mounted: 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 Alert: The light flashes when the alarm is on, accompanied by a beeping alarm sound, and the alarm time and sound are adjustable. 5. Alarm Clock Switch: Short press the horn button to turn off the alarm clock, the red light goes off, then short press the horn button to turn on the alarm clock, the red light is on. Specification: Item Type: Wall Mounted Decibel Meter Material: ABS Measurement Range: 30-130dB Accuracy: ±1.5dB (based on standard sound source, 94dB at 1KHz) Frequency Response: 31.5 Hz-8.5 KHz Frequency Weighting: A weighting Response Time: FAST (fast) Microphone: 6mm condenser microphone Digital Display: 3 digits Resolution: 0.1dB (<100dB) 1dB (>100dB) Alarm Alert: Support Alarm Output: Support Storage Function: Not supported Communication with PC: Not supported Display: 9.6 in Power Supply: DC5V 1A Type C USB interface Working Temperature and Humidity: 0-40℃, 10%-80%RH Storage Temperature and Humidity: -10-60℃, 10%-70%RH. Package List: 1 x Wall Mounted Decibel Meter1 x Charging Cable1 x Instruction Note: Under the normal measurement status, press and hold the "horn key" to enter the alarm setting, adjust the alarm value by up and down keys, short press the "horn key" to save the alarm value, or short press the "power button" to cancel the alarm setting. to cancel the setting.