1. Large digital LCD display, clear numerical values, easy to read. 2. It is easy to operate and does not require any settings. It can be used immediately upon startup. 3. Measurement range is 30 - 130dB. With upper and lower limit alarms. 4. The adjustable range of alarm time is 5-120 seconds (factory default of 120 seconds). 5. Alarm sound output function. Buzzing to remind you when the real time measurement is reach to the alarm level, and hold the data for 5s then back to normal mode. With hanging holes, can be hangged . Suitable for checking and monitoring the sound level for personal, families, business, studies, industrial, etc. Measurement Range: 30-130dB Frequency Response Range: 31.5Hz-8.5KHz Frequency Weighting: A weighting Response Speed: 8 times/second Accuracy: 1.5dB (with sound calibrator 94dB 1000Hz) Resolution:Less than 99.9dB: 0.1dB; 100dB: 1dB Power Supply Method: DC5V 1A Power Supply Port Style: Type-C Working Temperature: 0-40 Working Humidity: 10%-80% RH Storage Temperature: -10-60 Storage Humidity: 10%-70% RH Color: As Shown Material: plastic Package Contents: 1 x Wall-mounted decibel meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.