FNIRSI Noise Decibel Meter Home Volume Detector 1. Accuracy: 1.5dB (based on standard sound source, 94dB@1KHz) 2. Frequency range: 31.5Hz-8.5KHz 3. Dynamic range: 3.50dB 4. Measuring range: 30-130dB 5. Digital display: 4 digits, resolution 0.1dB, sampling rate 2 timessecond 6. Dynamic scale display: 1 scale represents 2dB, sampling rate is 2 timessecond 7. Dynamic scale range: 30-130dB 8. Overload indication: "OVER" and "UNDER" symbols indicate 9. Dynamic characteristics: two reaction speeds: FAST (fast) and SLOW (slow) 10. Microphone: 6mm condenser microphone 11. Battery: 600Mah3.7V lithium battery 12. Dual mode switching, sensitivity adjustable 13. 0.6mm high-precision sensor, accurate capture, immediate response 6cm sound guide tube & silicone pad sound insulation and waterproof pad, enhanced performance 14. Built-in 600Mah lithium battery, Typc-C charging head interface 15. VA color screen, ultra-clear backlight, clear readings, with alarm indicator light 16. Prompt when the upperlower limit is exceeded. The upper and lower alarm limits can be set separately. 17. Windshield design blocks all interference and is accurate. 18. Anti-slip silicone buttons, skin-friendly, rebound and comfortable to the touch 19. ABS shell, anti-fall and durable 20. Dimensions: 190x61x31mm