The product adopts ionic detection principle, the power is 9V battery. It can used only for the single room in the family. You should install a smoke alarm in each room in order to ensure your safety. Lease read the instruction carefully before you use it. Don't open the smoke alarm easily in case the operation isn't normal.  

★The ionization room is adopted single-power twin-room structure in the world, high sensitivity, good anti-jamming performance;   

★Adopted special control SMOS 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 simulated  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;

★Double alarm: Adopted double alarm of sound and audio, it could attend the common or lower audition user at the same time.