1. Calibrated sound source: 94dB/1KHz2. Measurement range: 30-130 dB, 35-130dB3. Resolution: 0.1dB4. Frequency response: 31.5Hz-8500Hz5. Rated current: 70mA6. Standby current: 5uA7. Power supply: 3.7V/1000mAh8. Charging time: 1.5h9. Use time: 8h10. Working temperature: 0 to 50 degrees Celsius11. Working humidity: 10-80%12. DC voltage range: 300mV-1300mV13. DC impedance: 120R14. Can be used for noise engineering, quality control, health prevention and environmental noise measurementSpecification: Package Weight One Package Weight 0.24kgs / 0.54lb One Package Size 19cm * 13cm * 5cm / 7.48inch * 5.12inch * 1.97inch Qty per Carton 80 Carton Weight 20.20kgs / 44.53lb Carton Size 54cm * 52cm * 40cm / 21.26inch * 20.47inch * 15.75inch Loading Container 20GP: 237 cartons * 80 pcs = 18960 pcs 40HQ: 551 cartons * 80 pcs = 44080 pcs