Specifications: Function: The ionization room is adopted single-power twin-room structure in the world, high sensitivity, good anti-jamming performance, Adopted special control cmos chip gather high compositive degree, steady performance, long using life; Tiny power consumption, battery for power source, safety, convenient installation, do not join other power source, Alarm function of low voltage, reminding you to replace the battery on time; Periodic testing: We suggest that you\'\'d better do a simulation testing every one week or every 15 days to guarantee your damage declining to lowest degree when happened danger, you only press the testing button gently for this work; Convenient installation: Do not effect by the position of power, spare the trouble of drawing power source, please refer to installation way and notefor the installation; Double alarm: Adopted double alarm of sound-audio, it could attend the common or lower audition user at the same time. Specification: Power source: Dc9v (cascading battery power) Working current: Surveillant current Alarm sound: Ambient temperature: -10~50 Ambient humidity: Less than 95%