Answer:
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
Used to keep prisoners silent and to make temporary repairs on cars.
The more you have of me, the less you see. Who am I?
Can describe a distress signal or flashy accessories.
It's in your hand though you cannot feel it. Only you and time can reveal it.
If I say "everything I tell you is a lie", am I telling you the truth or a lie?