Given the date, it does sound like a practical joke, but no. Camtraptions has released a solar panel for speedlights. Yup, you heard me. It definitely seems a little odd, but there’s a practical application here that’s pretty specific. It’s for using with camera traps that are often left out in the wilderness for days or weeks at a time or around dangerous animals where you don’t have the ability to swap out batteries every day.
The solar panel essentially keeps the speedlight’s batteries topped up during the day so that it can do its thing at night without user intervention. It plugs into an adapter cable that goes into the external power socket on the Camtraptions Flashes and then charges up four Ni-MH rechargeable AA batteries inside it.