Controller/Thread trimming foot switch YC-485
UPS deliverer was so stupid that can't find my house....
I had to go to UPS center to pick it up by myself. ><
UPS gave me a number 1-800-742-5877, 0-0 (person)
Next time if the same thing happened, at least I could talk to a real person not a silly machine.
Anyway, it worked smoothly again!!!
Thanks Dr. Elbert!!!! ^____^