There is an electric seam ripper out there that quilters are paying $21.00 for on Amazon.
You can get the same machine (The one I use to trim my horse!) without the fancy name for $7.99 by buying a Wahl Pocket Pro.
Here's a video about how it works, and she is using the Wahl that I use.
https://www.youtube.com/watch?v=z4dJfEPylYE
Watson