Free
It's free to download
Technical
- TinyFiveCircle
- Screws
- Switch (https://www.reichelt.de/Schiebeschalter/T-215/3/index.html?ACTION=3&GROUPID=3284&ARTICLE=19975&OFFSET=16&)
Version with Akku
- small cable tie
- 1/2 AA 3,6V Lithium Bat.
Free