With heat on full top of mouse, it can warm not just your palm, but also your fingers in the cold weather. Mouse connector: USB. Room temperature or 38 degree or 48 degree, 3 temperature levels for your choice, which can be adjusted accoring to your need.
You can also get this heated keyboard and mouse desk pad from Amazon.
I love this sleek-looking portable hand warmer for the mouse hand.
https://www.newegg.com/p/173-07D6-00014
I found one on eBay!