Teacher uses cheap laser and solar panel to transmit wireless sound — iPad powers home project that was inspired by solar panel making noise when attached to speaker

https://www.tomshardware.com/maker-stem/teacher-uses-cheap-laser-and-solar-panel-to-transmit-wireless-sound-ipad-powers-home-project-that-was-inspired-by-solar-panel-making-noise-when-attached-to-speaker