99View at Best Buy$249. 99View at Kohl's?Like the Nest Protect, the OneLink Safe and Sound detects smoke and carbon monoxide, sends an alert to your smartphone, and tells you the type and location of the fire or condition. But for those times when it's not warning you of fire, you can use it for a great many other things. With Amazon's Alexa and a very competent 10 watt speaker, the Safe and Sound can play music, listen to audiobooks, and access Alexa's thousands of skills. It's also compatible with Apple's HomeKit. However, the Safe and Sound requires a hard wired connection, and we found that the location of these connections doesn't make it the most conducive for using all of Alexa's capabilities.