About the product1. Small and portable 2. Can be used for measurement of noise engineering, quality control, health prevention and environmental noise 3. Suitable for factories, offices, families, and etc 4. Powered by 3 x 1.5V AAA batteries(not included)Features1. Measuring range: 30-130 dBA 2. Accuracy: +-1.5dB 3. Frequency response: 31.5Hz-8000Hz 4. Frequency weighting feature: A weighting 5. Resolution: 0.1dB 6. Operating temperature: 0 - 40 celsius degree, 10%-80% relative humidity 7. Storage temperature: -20 - 60 celsius degree, 0-90% relative humidity 8. Min/Max/lock current value 9. LCD backlight 10. Manual/auto power offSpecification: General Model GM1352 Size 155.6*49.6*26.6mm Weight 82g Package Weight One Package Weight 0.16kgs / 0.36lb One Package Size 20.8cm * 15.4cm * 5.1cm / 8.19inch * 6.06inch * 2.01inch Qty per Carton 20 Carton Weight 4.00kgs / 8.82lb Carton Size 53cm * 33cm * 23cm / 20.87inch * 12.99inch * 9.06inch Loading Container 20GP: 662 cartons * 20 pcs = 13240 pcs 40HQ: 1538 cartons * 20 pcs = 30760 pcs