These are simple notification sounds for charging or plug-in device.
In ZIP file you will find WAV and MP3 files:
Contains 3 unique sounds, plus 2 more sounds that are as a single file but with a plug sound in them.
Sound A – 0:05, Sound A without a plug sound – 0:05
Sound B – 0:05, Sound B without a plug sound – 0:05
Sound C a plug sound – 0:01
Enjoy and thank you for listening /purchasing