You’ve got your suitcase packed with clothes, shoes, and toiletries, and your carry-on has your passport, phone, and laptop. But one thing you are likely missing is a portable carbon monoxide detector. While you may already have one in your home, have you ever thought about bringing a carbon monoxide detector on the road? There have been a number of instances when hotel or vacation-home rental guests have been killed by carbon monoxide poisoning. The gas is odorless and tasteless, which is why it’s crucial to have a detector on hand.

“When renting a home or staying at a new place, travelers should ensure that there are working carbon monoxide detectors and smoke alarms to ensure their safety,” says John D’Alessandro, association secretary at The Firefighters Association of the State of New York (FASNY). “Often, vacation home rental sites will list safety amenities — if this information is not provided, make sure to double check with your host so you can be prepared with your own portable carbon monoxide detector.”

Most carbon monoxide leaks come from fuel-burning sources like furnaces or gas stoves. And, while you might not find those in many hotel rooms, D’Alessandro notes that improperly vented pool or spa heaters in hotels can also be sources of carbon monoxide leaks. “Carbon monoxide can spread quickly, so rooms near these amenities can be affected,” he says. Our favorite one to pack when we travel is the portable and easy-to-read First Alert CO710 Carbon Monoxide Detector, but we’ve listed multiple options that fit different needs.

Best Overall: FIRST ALERT Carbon Monoxide Detector

Why We Love It: It has a temperature display.

What to Consider: It has a lithium battery that can’t be checked.

The CO710 model detector from First Alert comes with a built-in lithium battery that will last for 10 years, making it the perfect device for taking on the road — no need to plug it into a wall or worry about batteries dying any time soon. If carbon monoxide levels become dangerous, an 85-decibel alarm will sound. It has a simple digital display that shows the current temperature as well as the concentration of measured carbon monoxide. This is a simple and effective device — and a reasonably priced one — that will get the job done. Just keep in mind you’ll need to bring this device in your carry-on bag when flying as the lithium battery cannot be removed or checked.

Price at time of publish: $45

Dimensions: 0.94 x 4.75 x 2.63 inches | Power Source: 10-year lithium battery | Decibels: 85 | Warranty: 10-year limited

 

Best Keychain: GZAIR SA103 Portable Carbon Monoxide Gas CO Detector

Why We Love It: It vibrates, which is helpful for those with sensory impairments.

What to Consider: It doesn’t float.

This small, waterproof carbon monoxide detector is ideal for adding to your keychain or backpack, particularly if you’re on a multi-day outdoor adventure like backcountry hiking or rafting. But it’s also useful if you’re traveling via plane, train, or automobile and want a portable device. There’s an LED screen that indicates carbon monoxide levels; if the gas crosses the threshold of becoming dangerous — yes, it can still happen outdoors — the device will emit a 95-decibel alarm, a red LED light will begin flashing, and the detector will vibrate (which is great for those with sensory impairments). It has a durable, bright orange rubber case to protect against damage and a battery that can last for two years with constant, 24-hour use.

Price at time of publish: $116

Dimensions: 4.3 x 1.8 x 1.3 inches | Power Source: Lithium 9V battery | Decibels: 95 | Warranty: N/A

 

Best Budget: Kidde Battery-Powered Carbon Monoxide Detector

Why We Love It: It has both visual and auditory cues.

What to Consider: It doesn’t really have any additional features.

This simple, affordable carbon monoxide alarm doesn’t have metaphorical bells and whistles. All it has are literal alarms — both an 85-decibel auditory alert and a flashing LED light. It’s powered by traditional alkaline batteries as opposed to long-term lithium batteries, so it’s best to have backup AA batteries with you when you travel, just in case they run out of juice. It’s also pretty small and lightweight (just 8 ounces), which makes it easy to take with you on the go. If you don’t need extras like a smartphone app or a digital display, this is a solid, practical option for a carbon monoxide monitor.

Price at time of publish: $38

Dimensions: 3 x 7 x 11 inches | Power Source: 2 AA batteries | Decibels: 85 | Warranty: 10-year limited

 

Best With Smoke Detection: Google Nest Protect 2nd Generation

Why We Love It: It’s the most aesthetically pleasing detector on this list.

What to Consider: It needs to be connected to Wi-Fi to send alerts to your phone when you’re away from your hotel room or vacation rental.

This sophisticated, dual carbon monoxide and smoke detector comes with many great features, including a convenient mobile app that allows you to control the detector and receive alerts remotely and, perhaps most importantly, a reminder of when it’s time to change the battery (no annoying chirps!). The Nest Protector also speaks rather than beeps to give precise information about what it detects and where the problem is. Just keep in mind that while the device doesn’t need Wi-Fi to detect carbon monoxide or smoke and sound the alarm, it does need it to send push notifications to your phone.

Price at time of publish: $119

Dimensions: 5.3 x 1.5 x 5.3 inches | Power Source: Energizer Ultimate Lithium “L91” AA batteries | Decibel: 80-85 | Warranty: 2-year limited

 

Best Plug-in: Kidde Nighthawk Plug-In AC/DC Carbon Monoxide Alarm Detector

Why We Love It: There’s a back-up battery in case the power goes out.

What to Consider: You should install carbon monoxide detectors at least 5 feet high in a room, so you’ll need to use the device’s extension cord for that.

If you’d prefer to run your carbon monoxide detector via a wall socket, this detector has prongs. But it also has a backup battery in case the power goes out. The device has an 85-decibel alarm that sounds when carbon monoxide levels are dangerously high — you can see how much there is via the digital display. Do note that carbon monoxide detectors should be installed higher in the room, not lower, so you might want to use the included extension cord to place it on a shelf or piece of furniture rather than directly into a wall socket. And don’t forget to consider adapters if you’re traveling internationally!

Price at time of publish: $31

Dimensions: 6.06 x 3.75 x 1.75 inches | Power Source: Plug-in + 9V battery backup | Decibels: 85 | Warranty: 10-year limited