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Editor's Notes & Price Research
Walmart's P9050 is photoelectric; Amazon's i9050 uses ionization; according to USFA site:
Both smoke alarms will detect the smoke from either a smoldering fire or a flaming fire; ionization smoke alarms tend to respond faster to the smoke produced by flaming fires than photoelectric smoke alarms; photoelectric smoke alarms tend to respond faster to the smoke produced by smoldering fires than ionization smoke alarms.
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