Answer:
Other terms for this handy device include doohicky, doo-dad, and whatchyamacallit.
What can't you see, hear or feel, until it’s too late. What shadows love, and shopkeepers hate?
What has to be broken before you can use it ?
They come out at night without being called, and are lost in the day without being stolen. What are they?
I am your mother's brother's only brother in law. Who am I?
I stay where I am when I go off. What am I?