At Elektor we are quite used to receiving badly addressed and/or labeled parcels accompanied by a scrap of paper with a cryptic text, and sometimes not even that, but in spite of these hurdles we usually manage to connect them to projects that are being worked on in our lab. Not this time, however, when a totally anonymous gift came in from Germany consisting of a small circuit board that, when powered on, produces high-pitched sounds. We made a video of it.     Did you make this? Why did you send it to us? Where is the source code? If you have anything to say about this, please post a comment below or on the page we created for it on Elektor.Labs. Thank you!