1. Accuracy: 1.5dB (based on standard sound source, 94dB@1KHz)2. Frequency range: 31.5Hz-8.5KHz3. Dynamic range: 3.50dB4. Measuring range: 30-130dB5. Digital display: 4 digits, resolution 0.1dB, sampling rate 2 times/second6. Dynamic scale display: 1 scale represents 2dB, sampling rate is 2 times/second7. Dynamic scale range: 30-130dB8. Overload indication: "OVER" and "UNDER" symbols indicate9. Dynamic characteristics: two reaction speeds: FAST (fast) and SLOW (slow)10. Microphone: 6mm condenser microphone11. Battery: 600Mah/3.7V lithium battery12. Dual mode switching, sensitivity adjustable13. 0.6mm high-precision sensor, accurate capture, immediate response 6cm sound guide tube & silicone pad sound insulation and waterproof pad, enhanced performance14. Built-in 600Mah lithium battery, Typc-C charging head interface15. VA color screen, ultra-clear backlight, clear readings, with alarm indicator light16. Prompt when the upper/lower 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 touch19. ABS shell, anti-fall and durable20. Dimensions: 190x61x31mmSpecification: Package Weight One Package Weight 0.33kgs / 0.74lb One Package Size 22cm * 10cm * 5cm / 8.66inch * 3.94inch * 1.97inch Qty per Carton 36 Carton Weight 12.98kgs / 28.62lb Carton Size 46cm * 32cm * 32cm / 18.11inch * 12.6inch * 12.6inch Loading Container 20GP: 566 cartons * 36 pcs = 20376 pcs40HQ: 1314 cartons * 36 pcs = 47304 pcs