
I ordered these for my outdoor cats when the temperature dropped below freezing. (These are barn cats that aren't potty trained, so they couldn't enter the house). I put heating pads in while they were in the needle. They are activated easily and quickly. After the first night I went out to check on them. They seemed to have done their job. The instructions said you could shake and reactivate for up to 10 hours if needed. I did this 10 hours later and it reactivated. They weren't as warm as the first time, but still warm enough to help. They don't get hot enough to burn your skin. Definitely an affordable solution to a temporary problem!

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