Roost Battery 2.0
This Wi-Fi-connected battery will send an alert to your smartphone when your smoke detector goes off.
Onelink Safe & Sound
This hardwired smart smoke detector has Alexa built in, but the premium is hard to inhale.
Smoke and fire detectors are an essential part of your home or apartment. Their loud, piercing alarms should wake you if there’s a problem, so you and your loved ones can safely escape, or put out the fire. Smart smoke detectors go a step further, as they can send an alert to your smartphone if they sense something amiss. That way, if you’re at work, or out of town, you can call the fire department or a neighbor check on your house, to see if everything is OK. Another benefit of a smart smoke detector is that you can temporarily silence the alarm from your smartphone — so there’s no more trying to jab the Silence button with a broomstick after you set it off while cooking a steak.
There's not a lot of choice when it comes to smart smoke detectors. Our favorite for a few years running is the Nest Protect. It's the most full-featured alarm, blaring out a loud siren and telling you where the problem is. It works with a lot of other smart home systems, so for example it can turn on all your Philips Hue lights, making it easier to find your way out. However, if you don't want to spend more than $100 on a smoke detector—you should have several in your home—then check out the Roost Smart Battery. This 9-volt Wi-Fi connected battery costs just $35, goes into any smoke detector, and alerts your phone when the alarm goes off.
Make sure you check out all of our top picks for smart speakers, lights, locks, and more on our best smart home gadgets page.
Latest News & Updates (August 2019)
- FirstAlert has launched the OneLink Secure, a mesh router that can link to its OneLink Safe & Sound smoke detector, and send out warning messages to devices on the network with screens--such as smartphones, tablets, and TVs--in the event of a smoke, fire, or carbon monoxide condition. The tri-band 802.11ac OneLink Secure Connect base station is $149, and should cover up to 2,500 square feet. A bundle with the base station and two satellites costs $329.
- Google is phasing out the Works with Nest program at the end of August; Nest owners should transition to a Google Account to continue to receive updates. Google says it is working to enable the same smart home integrations with Google Assistant as there are with Works with Nest.
MORE: Best Smart Home Deals
Nest’s smoke alarm detects both smoke and carbon monoxide, and when it does pick up something, it will not only sound an alarm, but will also tell you in what room the alert is coming from, and the nature of the alert. An LED ring on the bottom of the alarm also changes color, giving you a visual cue.
The Nest Protect comes in both wired and battery-powered versions. If you have more than one in your home, and one goes off, the others will too, alerting you to the location of the fire.
The Nest Protect also works with a wide range of smart-home devices. For example, in the event of an emergency, the Nest can automatically turn on your lights, making it easier for you to get out of your house.
What Owners Are Saying
On Best Buy, the Nest Protect has an average rating of 4.8 stars from more than 1,200 reviews.
While many acknowledged its high price, most complimented its performance, compatibility with other smart home devices, and built-in night light. "
"What I personally like is the ability to know exactly where smoke would be coming from. If I were to be on the fourth floor in the middle of the night, it would say 'there is smoke in the living room'," wrote one reviewer.
Best Budget Option
The Roost battery is the best — well, only — option for those who already have smoke detectors, and want to make them “smart.” That’s because the Roost battery, which is Wi-Fi- enabled, sends an alert to your smartphone when the siren goes off. The second-generation battery looks and acts like the original, but has a much easier setup process.
Through the app, which can accommodate a large number of connected batteries, you have the option to silence the alarm for up to 2 minutes, and automatically send an alert to someone else. 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 Saying
The 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.
Like the Nest Protect, the OneLink Safe & 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 & 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 & 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.
What Owners Are Saying
Of the 200-odd reviews on Amazon (where it has an average rating of 3.3 stars), the most positive commenters noted its ease of installation, as well as the fact that they could stream music, and that the alarm's nightlight was bright. Chief complaints were that it doesn't support all of Alexa's features (such as Drop-in), and that it's expensive.
"The speaker is okay, definitely not audiophile level, but capable, installation was easy, and the light that shows it's listening or received a notification also doubles as a night light," wrote a Vine reviewer.
Another owner noted that the mounting bracket is nonstandard, and it took a lot of effort to attach the smoke detector. "Alexa integration is pretty good," she write, "but you can't change the wake word, which is a problem if you have two installed within earshot of each other. And I kind of had to speak loudly to get its attention in a room with an air conditioner. Which meant that the upstairs one heard me, too. But, hey, it plays music. And the speaker's okay."
Other Smart Smoke Detectors Reviewed
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. Green and blue indicate that the alarm is starting up or in pairing mode. Yellow means there's a malfunction or a low battery, while red means there's a fire or smoke condition.
Onelink's alarm uses photoelectric technology, which is generally better at detecting smoldering fires than are alarms that use ionization technology. However, the latter are better at detecting fast-burning fires.
The Onelink can be connected to HomeKit and Alexa (but not Google Assistant), so you can ask both Siri and Amazon's voice assistant for the status of the smoke detector, but not much else. By contrast, if the Nest Protect detects fire or carbon monoxide, you can have it automatically turn on a security camera, open Lutron blinds, turn on Philips Hue lights, turn off your heat and more.
Setup should theoretically be easy—just scan a HomeKit code in the Onelink app—but it took a few tries to get it to work. The Onelink smoke and carbon monoxide alarm is good on its own, but the Nest Protect does more for the same price.
What to look for in a smart smoke detector
Fire and smoke detection sensors. All smoke detectors use one of two types of sensors to detect fires. Ionization-type sensors are best at detecting fast-burning fires, while photoelectric sensors are generally better at alerting you about smouldering, or slow-burning fires. You should have both types of alarms in your house. Smoke alarms such as the Nest Protect are designed to pick up both types of fires.
Carbon monoxide and other gas detection. Even if you don't have a fire in your home, you can be suffocated by carbon monoxide. A good detector should also protect you against this.
Hardwired vs. Battery-powered. If your home has hardwired alarms, they will all be interconnected, so that if one goes off, they all will go off. Hardwired alarms also receive their power from your home, and only use batteries as backups. Standalone detectors run on batteries alone, so they may need to be replaced more often, and cannot signal each other in the event of an emergency (Nest's and OneLink's alarms are an exception to this). However, it's a lot easier to mount standalone smoke detectors where you need them.