The ionization room is adopted advanced single-power twin-room structure in the world, economize eletricity, 9V battery as power source, it is used in single room in family, for your safety, you抎 better install an alarm in every room. Please read the instruction carefully before you use, do not open the alarm easily to avoid being irregular for working. You could not replace any component in this product except for battery to avoid being irregular for working, if there is any wrong with it, please contact the supplier promptly.