1.Available for Natural gas, LPG, etc. 2.Alarm level: 10%±5%LEL, 3.Wall mounted;easy to install. 4.Be able to work with electrovalve /exhaust fan/Manipulator. 5.MCU Processing adopted, 6.Malfunction auto-check indicator. 7.SMT manufacture technology,High stability. 8.Alarm output:Sound&Flash alarm. 9.Operating voltage: 85V-265V AC;Static current: ≤30mA, Alarm current: ≤40mA. 10.Rated power: less than 2.5W; 11.Sound level: ≧85db (within 1 meter). 12.Execute Criterion:GB15322;EN50194;UL1484. 13.Dimension:115*72*41mm. 14.sending frequency：315MHZ or 433MHZ，sending distance：100m(open area)