Item: SW525A(red light)/SW525B(red light)/SW525G(green light)/SW526A(red light)1. Screen size: 9.6 inch (SW526A 18 inch)2. Measurement range: 30-130dB3. Accuracy: +/-105dB4. Frequency response: 31.5Hz~8.5Hz5. Microphone: 6 mm condenser microphone6. Digital display: 3 digits7. Power supply mode: DC 5V 1A Micro USB interface8. Working temperature and humidity: 0 ~ 40 degrees, 10% ~ 80% RH9. Storage temperature and humidity: -10 to 60 degrees, 10% to 70% RH10. Size: 21 × 13 × 2.8 cm(SW526A: 40×23×3.5cm)11. Net weight: 453 grams(SW526A:1531g)Item: SW535A1. Screen size: 18 inch2. Measurement range: 30-130dB3. Accuracy: +/-1.5dB4. Frequency response: 31.5Hz~8.5Hz5. Microphone: 6 mm condenser microphone6. Digital display: 3 digits7. Power supply mode: DC 5V 2A power supply8. Working temperature and humidity: -20 ~ 60 degrees, 0% ~ 100% RH9. Storage temperature and humidity: -10 ~ 60 degrees, 20% ~ 70% RH10: Alarm prompt: sound + display alarm11. Alarm output: output 5V voltage12. Size: 40 x 23 x 3.5 cm13. Net weight: 1531 gramsSpecification: Package Weight One Package Weight 0.50kgs / 1.11lb One Package Size 23cm * 13cm * 5cm / 9.06inch * 5.12inch * 1.97inch Qty per Carton 60 Carton Weight 30.00kgs / 66.14lb Carton Size 50cm * 50cm * 60cm / 19.69inch * 19.69inch * 23.62inch Loading Container 20GP: 177 cartons * 60 pcs = 10620 pcs40HQ: 412 cartons * 60 pcs = 24720 pcs