Quoted from mrm_4:Bought a couple boxes of these after seeing Ronnie’s video.
https://www.memotronics.com/box-of-10-455-blinking-lamp-bulb-flashing-lightbulbs-6-5v-3-25w-0-5a/Jump to 18 minutes to see the explanation and demo.
If you read PBL's message above, they're all coming from the same factory. This 'memotronics' isn't the ones actally makin' them, AFAIK.