Features 1. Windshield design: block all interference, accurate and error-free 2. Non-slip silicone buttons: feel comfortable and easy to operate. 3.VA color screen alarm indicator light 4. Dual-mode switching sensitivity adjustable: FAST/SLOW time weighting, one-key switching 5. Wide range of applications: site construction, residential environment, libraries, public places, offices, workshop production, etc. Specification Model: FDM01 Accuracy: 1.5dB (based on standard sound source, 94dB@1KHz) Frequency range: 31.5Hz-8.5KHz Dynamic range: 3.50dB Measurement range: 30-130dB Frequency weighting characteristics: A weighting Digital display: 4 digits, resolution 0.1dB, sampling rate of 2 times / sec. Dynamic scale display: 1 scale represents 2dB, sampling rate is 2 times/sec. Dynamic scale range: 30-130dB. Overload indication: "OVER" and "UNDER" symbols indicate Dynamic characteristics: FAST (fast) and SLOW (slow) two kinds of response rate Microphone: 6mm condenser microphone Maximum lock: MAX Battery: 600Mah/3.7V lithium battery Interface: Type-C Operating temperature and humidity: 0-40,10%-80%RH Storage temperature: -10-60,10%-70%RH List 1 x Noise meter(With Battery) 1 x Instruction manual 1 x Type-C charging cable