This special offer is valid March 13 - 31. Get free shipping sitewide on orders over $149. Free shipping applies only to standard ground shipping in the lower 48 states. Freight shipping is not included in this offer. Not to be combined with any other offer.
We reserve the right to change the terms of this special promotion at any time without prior notice.
BRK Brands / First Alert Ionization detectors consist of two plates separated by about a centimeter. The battery applies a voltage to the plates, charging one plate positive and the other plate negative. When smoke enters the ionization chamber, the smoke particles attach to the ions and neutralize them, so they do not reach the plate. The drop in current between the plates triggers the alarm.
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