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Watch this helpful video to learn how to use your Patio Shield and discover other useful tips. Please note that due to environmental factors, your refill mat may change color sooner than the expected four hours. Continue using it until the full four-hour duration has passed.

Thermacell products repel against various species of mosquitoes. We have tested our product against the Western Africa, Asian Tiger, Yellow Fever, mosquitoes and found it to be effective against all of them. If traveling to regions where malaria is present, then we recommend speaking to your physician about malaria prophylaxis prior to leaving.

Do not expose Thermacell appliances or mats to rain. Their effectiveness may be diminished. If your Thermacell device does gets wet, please ensure it is fully dry inside and out before your next use.

In breezy weather, place the unit upwind of your location so that the repellent is carried by the wind into the area you want to protect. Thermacell may be less effective on very windy days, although mosquitoes aren't typically out when it is very windy.

Thermacell products are for outdoor use only and should not be used in enclosed spaces. You should always follow label use instructions.

Our products have the following altitude limitations:

1. The mat and fuel powered products products (Handhelds, Lanterns, Patio Shield) have an altitude limitation of 4,000 ft.
2. The Backpacker product has an altitude limitation of 7,000 ft.
3. The Rechargeable repellers (Radius, E55, EX55, E90 and E90X) have no altitude limitations.
4. LIV Smart Repellent System has no altitude limitations.

We hope this helps answer your question, please feel free to contact us if you have any further questions.