Smoke detector CO detector 2in1 smoke and carbon monoxide detector fire protection CO sensor RH-602

Features: Verified : CE Certification with Alert Criteria EN50291. High-precision electrochemical sensor ensure the safety   Low Battery Warning: When the detector is in a low battery, there will be sound of ‘beep’every 30 seconds, and the LCD display will show ‘Lb’ Test/Reset Button: Detector can normally work if it alarms when the button is pressed for seconds   CO Concentration & Alarm 50 ppm - Alarm within 60-90 minutes 100 ppm - Alarm within 10-40 minutes 300 ppm - Alarm within 3 minutes   Specification: Required Battery: 3x AA Batteries (Not Included) Quiescent Current: <35uA (last one year) Alarm Current: <20mA Voltage: 3V±0.3V Alarm Decibel: 85 dB in 3 meters Working Environment: 0-45℃ / 20%-95% R.H Dimension: diameter=100mm / height=38mm Weight: 120g   Package contents: 1*CO Detector