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And the speaker's okay. 21 View at Amazon$119. 99View at Best BuyCheck Walmart?The second generation Onelink Smart Smoke + Carbon Monoxide alarm comes in battery and hardwired models. Similar to the Nest Protect, the Onelink will not only sound an alarm, but also specify the room affected and the type of alert: smoke or carbon monoxide. Also like the Nest Protect, if you have more than one Onelink alarm, you can interconnect them so that if one goes off, they all will. An LED rings the middle of the alarm and changes color based on the alarm's status.