Additionally, you can link the Roost battery to other smart home products through IFTTT, to, say, turn on your lights when the alarm goes off. The battery is designed to last up to five years, and will work with any smoke/CO alarms that use a 9 volt battery, which includes hard wired alarms with a 9V battery backup. Roost has updated its app so that users can get notified when there is a severe weather alert, such as hail, freezing temperatures, heavy rainfall and snow, and storms and high winds. What Owners Are SayingThe original Roost Battery has only about 200 reviews on Amazon, where it gets an average of 3 stars. Among the top comments, several praised Roost’s customer service in troubleshooting issues. “This device is pretty innovative, and a super easy, super cool way to connect up your alarm monitoring,” wrote one person. 66 View at Amazon$229. 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.