SMART SENSOR Nitrogen Dioxide Gas Concentration Digital Display Detector 1. Detected gas: nitrogen dioxide 2. Measurement range: 0~20ppm 3. Resolution: 1ppm 4. Sensor: electrochemical sensor, two-year lifespan 5. Lowhigh concentration alarm: yes 6. Alarm value setting: yes 7. Alarm indication: audible, visual, and vibration triple alarm, alarm values ??can be set 8. Power supply: 3.7V lithium battery 9. Accurate sensor, sensitive response, accurate measurement, good stability and repeatability, able to detect and alarm promptly, ensuring no danger is missed. 10. Adopts a high-decibel buzzer alarm, light, and vibration triple alarm system. Alarm values ??can be set, and the sound can reach 80 decibels. 11. Rechargeable 3.7V lithium battery, long service life, safe and durable, long battery life, approximately 9 hours of use on a single charge. 12. Compact and portable size, suitable for measurement in various complex environments and locations, convenient and practical. 13. Weight: 200g 14. Dimensions: 120x64x38mm