1. Measurement range: 30dB - 130dB2. Accuracy: about 1.5dB (based on standard sound source, 94dB@1KHz)3. Resolution: 0.1dB (less than 100dB); 1dB (more than 100dB)4. Frequency response: 31.5Hz - 8.5KHz5. Sampling rate: 2 times / second6. Sensor type: 6mm condenser microphone sensor7. Display mode: LED digital tube, single word 4 inches8. Alarm output: 12V high level9. Alarm prompt: sound + prompt10. Operating environment: 0 - 40 degrees Celsius, within 80% relative humidity, indoor altitude less than 2000m11. Storage environment: -10 - 60 degrees Celsius, within 70% relative humidity12. Input: DC 5V/1A13. Power supply: USB direct plug14. TA654A test cable length: about 5 meters15. Size: approx. 32.3 x 17.3 x 4cm16. Weight: about 980gFeatures:1. Highly sensitive 1/2 inch condenser microphone with high accuracy, high sensitivity and instantaneous response (TA654A external sensor)2. 13-inch large screen display3. Back hidden bracket design, can be placed on the desktop4. A variety of fixed ways, wall hanging / hanging / placed / external bracket5. Upper limit alarm prompt: the upper limit alarm threshold can be set, when the measurement is higher than the set threshold, the buzzer will alarm prompt sound, and the alarm prompt light flashes, the time can be set to: 65-120s6. Back panel design, the top and bottom have 2 ventilation holes, more responsive7. Analog bar level indication8. Alarm signal output interface, the use of 3.5mm two-section or three-section headphone plug 12V alarm horn (not included)Specification: Package Weight One Package Weight 1.70kgs / 3.74lb One Package Size 40cm * 24cm * 8cm / 15.75inch * 9.45inch * 3.15inch Qty per Carton 10 Carton Weight 17.00kgs / 37.48lb Carton Size 45cm * 42cm * 52cm / 17.72inch * 16.54inch * 20.47inch Loading Container 20GP: 271 cartons * 10 pcs = 2710 pcs40HQ: 629 cartons * 10 pcs = 6290 pcs