It's a rather unusual squealing, undulating yet rhythmic beeping type of noise, kind of like a chainsaw, a jet plane, whale song, and a trapped coyote mixed together. it's very loud, performed nearly every waking moment of the mouse's life, and only it stops when it dies. Sometimes they also make loud popping noises, or rarely they'll sound so much like a pelican it's unreal.
no it is a long o sound
The words "mouse" and "how" both have the same vowel sound, pronounced as /aʊ/.
squeak
squeak!
it screeches
If it only happens when you plug the mouse in (and not with other peripherals) it sounds like a hardware problem with the mouse USB cord. Try another mouse - if the problem cures itself - the mouse is faulty - if not, then the problem is in the computer itself.
While there is no official name to the sound and noise that a mouse makes, it is generally called a "squeak" based on the squeaky nature of the tone of the sound. These squeaks help a mouse communicate all different sorts of emotion ranging from happiness to sadness to even hunger.
mice are vocal. they chirp and speak.
mouse and keyboard
cit...cit...cit
eep eep eep
"Steamboat Willie" 1928