These turners have been around for a while. In fact, they're getting hard to find and I was happy to find these. These require a socket on an incandescent light string drawing more power than the bulb so you can't use too many. Considering all that, they work just fine if the ornament isn't too heavy.
Plug in an ornamotor into one of the sockets of your incandescent Christmas tree lights. Hook the ornament onto the ornamotor. Turn the Christmas tree lights on and watch the ornament twirl! Very pretty!