Hang by a thread is an idiom that's used to describe any risky situation, or danger of something unlucky or bad happening.
For example:-
After the car accident her life was hanging by a thread.
But this photo shows my poor microphone which is literally hanging by a thread.
So, if you're looking for a new headset, this is a 2-month-old Creative Sound Blaster Audio Surround USB headset. Creative who designed this headset with detachable microphone, don't sell replacement microphones! Grrrrr