Sold in black or white versions, Nest Labs' new Nest Protect ($129) is the third product from former iPod creator Tony Fadell's home automation company, following the release of first- and second-generation Nest Learning Thermostats. As a rethinking of the conventional smoke and carbon monoxide alarm, Nest Protect eliminates some of the annoyances associated with prior products in that category: rather than just beeping and wailing, Nest Protect primarily…
