Must-Have Safety Gadget for Home & Travel One of the Smartest Safety Gadgets We’ve Bought! I grabbed this portable carbon monoxide detector for peace of mind when we travel—and I’m so glad I did. It’s compact, rechargeable, and gives you real-time CO levels, temperature, and humidity on a clear digital screen. Whether you’re RVing, staying in rentals, or just want extra protection at home, this little device is a no-brainer. safety travel