Answer:
Spies and detectives do this to phones and musical shoes make this sound.
What Can Fly Without Wings
What has no hands but might knock on your door, and if it does you better open up?
When is 1500 plus 20 and 1600 minus 40 the same thing?
Once you have it, you want to share it. Once you share it, you donβt have it. What is it?
People take me on walks and I run and have fun. What am I?