1. Calibrated sound source: 94dB/1KHz
2. Measurement range: 30-130 dB, 35-130dB
3. Resolution: 0.1dB
4. Frequency response: 31.5Hz-8500Hz
5. Rated current: 70mA
6. Standby current: 5uA
7. Power supply: 3.7V/1000mAh
8. Charging time: 1.5h
9. Use time: 8h
10. Working temperature: 0 to 50 degrees Celsius
11. Working humidity: 10-80%
12. DC voltage range: 300mV-1300mV
13. DC impedance: 120R
14. Can be used for noise engineering, quality control, health prevention and environmental noise measurement