The hardware static sound is a faint “hissing” noise that can be heard only in very quiet environments when the earbuds are playing silent audio. This sound is a fixed characteristic of the hardware and does not indicate any malfunction.
In typical office environments, occasional noticeable background noise (such as buzzing, popping, or static) can appear during certain operations with the earbuds or phone, then disappear. This is a type of incidental noise from the earbuds and is not related to the hardware static sound. Please take note of this distinction.