Cable Release

This is called a cable release. You use it to trigger a camera. The right hand end screws into the shutter button and you press the plunger on the left hand end to fire the shutter without shaking the camera.

I’ve had to buy this one because my cable release has disappeared. I know that as soon as it arrives I will instantly find the original. I think it is one of the laws of the universe that this is how it works.