The best way to describe this sound is to actually say that is a sequence of “noises” that lasts for short time in a relatively dry environment. It is incredibly artificial sounding but the actual source of the sound itself is not generated from electronics (in other words, it is not coming from speakers or anything like that). It does last for a short time and sometimes the exact sequence of the noises in different depending on the circumstances.
There are several things I find interesting about this noise. If it is the correct “version” of the noise, it actually causes me to feel nostalgia which is probably rare for noise. It’s not obnoxious or invasive really and honestly, I find it kind of pleasant. At some point in the sequence, the noise is partly being caused by it’s source acting on something else in addition to itself which makes the sound slightly more complex, but it also brings with the knowledge that the something is being acted upon (and this is generally a desirable thing when it happens).