HELLO. DOES ANYONE HERE KNOW IF THERE EXIST SOLARPOWERED ELECTRONIC

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HELLO.

DOES ANYONE HERE KNOW IF THERE EXIST SOLARPOWERED ELECTRONIC "NO SMOKING" SIGNS THAT USE THEIR SURFACE ITSELF TO GATHER CHARGE?

TODAY I WAS IN LINE AT THE BANK; THE LINE WAS NEXT TO A SUPPORT COLUMN; GLUED TO THE SUPPORT COLUMN THERE WAS A THIN, APPROXIMATELY TWENTYFIVE BY TWENTYFIVE CENTIMETERS, "NO SMOKING" SIGN.

WHISLT STANDING IN THE LINE, THE SIGN SUDDENLY FLASHED WITH "BLUISH" LIGHT, WHILST MAKING AN ELECTRONIC "BLOOP" SOUND; A WOMAN TWO PLACES IN FRONT OF ME NOTICED THE SOUND COMING FROM THE "NO SMOKING" SIGN ALSO —I IGNORE IF SHE SAW THE FLASH—; I KEPT STARING AT THE SIGN; IT DID NOT FLASH, NOR EMIT SOUND, AGAIN; IT ONLY SLIGHTLY GLIMMERED "WHITE" FOR ONE SECOND.

IT WAS NOT A HALLUCINATION, THERE WERE NO CABLES ATTACHED TO THE SIGN, NOR WAS THE SIGN THICK ENOUGH TO HAVE ANY KIND OF INTERNAL POWER SOURCE.