residential home security systems
Traditional smoke detectors typically cost between $10 and $40. Here are a few basic models that are popular on Amazon:First Alert BRK 3120B $27. 18 This hardwired alarm uses both photoelectric and ionization sensors to detect smoke. It does not have a carbon monoxide sensor. First Alert SCO7CN $25. 97 This battery operated model has a photoelectric smoke sensor as well as a carbon monoxide detector. In addition to its siren, the unit can voice warnings and instructions. First Alert P1010 Atom $24. 88 This model uses a photoelectric sensor to detect smoke and is more compact than traditional smoke detectors. First Alert BRK 9120B $9. 81 and Kidde i4618AC $14.