JSN-JY-909COM Smoke Carbon Monoxide Alarm Detector without Battery

1. Product size: 37x107mm 2. Working power: DC 4.5V 3 AA batteries 3. Applicable gas: smoke, carbon monoxide 4. Sampling method: natural diffusion 5. Sensors: semiconductor sensors, electrochemical sensors 6. Alarm set value: smoke 0.3db/M 7. Indoor temperature: -10 - 55 degrees Celsius 8. Response time: less than 30 seconds 9. Recovery time: less than 30 seconds 10. Alarm mode: sound and light alarm 11. Service life: about 3 years 12. Standby current: less than 105uA Note: This product is shipped without battery