A travel carbon monoxide detector is something many people don’t think of when planning for a trip, but it should be included in every traveler’s bag. This colorless, odorless gas can build up in poorly ventilated homes, hotels, and rental units, as well as cars that aren’t running properly or are left unattended for long periods of time. It can lead to headache, dizziness, nausea, weakness, confusion, and death. If you suspect CO poisoning, get fresh air and call 911 (or whatever your local emergency number is).

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The good news is that portable carbon monoxide detectors are inexpensive and easy to pack. There are both plug-in and battery-powered models available, with some offering backup batteries. You’ll also want to consider display type and additional features when deciding which one is best for your travel needs.

For example, if you’re staying in an apartment with an electric fireplace that isn’t properly vented, you’ll want a model that detects CO levels and warns you of high levels with a loud 85-decibel alarm. On the other hand, if you’re heading off the beaten path and into more rural areas, you’ll want a detector that can run on battery power and doesn’t require an electrical outlet to operate.

This Kidde carbon monoxide detector is a great option for backpackers, hikers, and anyone who stays in temporary accommodations while traveling. It runs on two AA batteries, weighs less than a pound, and fits easily into most luggage. Plus, it has a UL 2034 mark on its packaging that proves it meets the carbon monoxide safety standard in the United States.