Thank you Tony
I had a few days ago to understand the reason
twiddler3 can be automatically found and used by imac and iphone easily
No need to insert LM506(USB Adapter)
But if it is windows, need to through LM506
and I don't know why on my computer
can't recognize LM506 as a device
So I need to install the driver
to make sure the computer recognizes the LM506 as a bluetooth device
Then I can find my twiddler