The BRK 3120B smoke detector from First Alert contains dual sensors. A photoelectric sensor detects slow and smoldering fires, while an ionization sensor can detect often fast moving open flames. It averages 4.5 out of 5 stars from over 220 people (read reviews) and you can buy it now on Amazon for $29.97. An alternate version of this model (not currently discounted: see it here) comes powered by sealed lithium batteries that provide continuous protection for ten years without needing replacement.”]