1.Available for CO(carbon monoxide). 2.Alarm level:150PPM, 3.Wall mounted;easy to install. 4.Be able to work with electrovalve. 5.MCU Processing adopted, 6.Malfunction auto-check indicator, 7.SMT manufacture technology ,High stability. 8.Alarm output: Relay output / Sound&Flash alarm; 9.Operating voltage: DC12V-24V,Static current: 50mA@12V,25mA@24V, Alarm current: 90mA@12V,60mA@24V. 10.Rated power: less than 3W; 11.Sound level: ≧70db (within 1 meter). 12.Execute Criterion:GB15322;EN50291;UL2034;EN50194, 13.Dimension:115*72*41mm