we are offering combustible gas alarm. 1. model: ak-200fcq2 2. sensor:japanese electrochemistry sensor 3. agent query function 4. alarm record query function 5. smart voice alarm and digital display6. alarm point settings7. concentration unit conversion 8. suitable gas: natural gas9. measure range: 0-50kppm 0-100%le 10. display range: 0.8-30.0kppm 1.6-60%lel11. concentration alarm: 5.0kppm (10%lel )12. alarm point set : 19.9kppm 2-19.8%lel13. working environment: 0-60 95%rh 14. input power : ac220v15. static power: 1.2w16. alarm power: 3w17. response time: 30 second18. alarm sound: 80 decibel (within 1m)19. gas sensor: service life for 5 years