I agree.  They are so cheap.   The ones I install are less than ten dollars.  Won&#x27;t name the brand.  They are usually on the bottom of the shelf. Hidden away from worrisome consumers that equate price with function.  Many contractors buy them by the case.<p>I usually install two, and run a electrical line to one.<p>Yes, an app is fine if you burn food, and have the disposable income?  I would rather see home owners spend the money on running a line to their smoke, and CO detectors though.