Winter is coming, but that doesn’t mean you need to go through another season of frozen digits and poor circulation. This October Prime Day Amazon is offering up an excellent deal on Unihand’s Rechargeable AI Hand Warmers for only $18.99, which is a steal at 37 percent off. About the size of a small computer mouse and weighing only 0.15 lbs, these portable handwarmers are a life (and hand) saver.

Now, I know what you’re probably thinking: 1. Why do I need rechargeable hand warmers? and 2. Why the heck does AI need to be involved?

The answer to the first question is simple: you’ve just never known that you needed rechargeable hand warmers. I live in a cold climate and the winters here can be pretty brutal. On top of that I sit at my desk most of the day so my hands in particular get really cold. A few years ago I bought some rechargeable hand warmers in a desperate bid to cure my benumbed appendages and I’ll never look back. 

Not only did they cure my cold hands, they probably helped save me from worse effects down the line like carpal tunnel. Now, I simply can’t live without them in the wintertime. I use them at my desk of course, but I also take them out on dog walks, or anytime it feels a bit nippy. 

As for the second point, I agree that AI probably isn’t necessary in most things. But these hand warmers are an exception. Unlike other rechargeable hand warmers that only come with low, medium, and high heat settings, these have an AI temperature sensor that analyzes and adjusts the temperature to ensure optimal comfort and safe heating.

Also, that same AI tech means better battery efficiency too. These bad boys will net between 8.5 and 20 hours of warmth between charges which is way more than any other hand warmers I’ve ever had.

This October Prime Day treat yourself to some new AI hand warmers and enjoy the coming winter in comfort—I know I will.