WADFOW WJN3501 sound level detector device

Measurement range: 30-130 decibels Dynamic range: 50 decibels Sound pressure accuracy: ±1.5 decibels (94 decibels at 1 kilohertz), ±1.5 decibels (94 decibels at 8 kilohertz) Frequency response: 30 hertz-8 kilohertz Microphone: Condenser microphone with polar pattern and backlight function with low battery signal function packed in a color box