SNDWAY Wall-mounted 30~130dB Large Screen Digital Display Noise Decibel Monitoring Testers, Specification:SW526A 18 inch Display 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: 30-130dB 3. Accuracy: +-105dB 4. Frequency response: 31.5Hz~8.5Hz 5. Microphone: 6 mm condenser microphone 6. Digital display: 3 digits 7. Power supply mode: DC 5V 1A Micro USB interface 8. Working temperature and humidity: 0 ~ 40 degrees, 10% ~ 80% RH 9. Storage temperature and humidity: -10 to 60 degrees, 10% to 70% RH 10. Size: 21 ?? 13 ?? 2.8 cm(SW526A: 40??23??3.5cm) 11. Net weight: 453 grams(SW526A:1531g) Item: SW535A 1. Screen size: 18 inch 2. Measurement range: 30-130dB 3. Accuracy: +-1.5dB 4. Frequency response: 31.5Hz~8.5Hz 5. Microphone: 6 mm condenser microphone 6. Digital display: 3 digits 7. Power supply mode: DC 5V 2A power supply 8. Working temperature and humidity: -20 ~ 60 degrees, 0% ~ RH 9. Storage temperature and humidity: -10 ~ 60 degrees, 20% ~ 70% RH 10: Alarm prompt: sound + display alarm 11. Alarm output: output 5V voltage 12. Size: 40 x 23 x 3.5 cm 13. Net weight: 1531 grams