Tournesol 🌻 (@tournesol)

Oh right @Njord insisted I tell you, fedi, about this button. It's a big orange button (AC remote for scale) that toggles an extension cord's power on/off when pushed

So far so boring right? Well it had been acting up a bit so we opened it up to change the battery and... no battery?

It apparently uses the mechanical force of pushing the button (it requires a bit of a push!) to trigger a piezoelectric charge which is apparently enough to send a wireless signal to the receiver

Neat!