Safe for non-stick pans and able to be used in boiling liquids, this automatic hands-free sauce stirrer is says it is able to stir for up to four hours on one set of AA batteries (not included).
Just think, for the ability to save some energy in your arm, you can create more dead batteries for the local landfill. According to the comments, most of the time this device doesn’t even stir, it just vibrates against the side of the pot which means the device ends up in the landfill too.
NOTE: This device, should you purchase one that actually works, may be of value if you have reduced mobility in your hands, arms, or shoulders. Proceed with caution though.