Endless Original Birthday Card with Glitter
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Shop EU PartnerThe original endless birthday card — and it does not quit
The cover says "Happy Birthday to You!" The inside says "Forever." And it means it. This is the card that looks like a beautifully designed birthday greeting right up until the moment they open it — and a loud, cheerful "Happy Birthday" song starts playing on a loop and won't stop.
We've made this card for over a decade. It's the one that started it all, now with an updated look but the same relentless cheer underneath. The recipient will almost certainly text you "what did you DO?!" — which might even start a conversation if you haven't talked in a while. Unlike a paper card that gets read once and recycled, this one keeps singing for hours. For any birthday, any age, anyone who deserves to have their day celebrated whether they like it or not.
How the Endless Musical Card Works
- Open the card to test the sound, sign it, then close the card to stop the sample.
- Insert the card into the envelope and pull the tab from the spine to arm it.
- Once they open the card, it loops non-stop — even if they close it — and plays for hours, until the battery dies.
- If they try to break the card to stop the sound, a hidden glitter trap is waiting inside.
*Plain white envelope included in all cards
Great For
- Family birthday parties — the card that becomes the running joke every birthday after this one.
- Office birthdays — cheerful enough to seem sweet, relentless enough to take over the whole floor until the battery dies.
- Milestone birthdays — 30th, 40th, 50th, the years that deserve a "Happy Birthday" that refuses to end.
- From the kids — "we picked it out ourselves," which is, of course, exactly the problem.
- Anyone who tries to shut it off — prying open the battery to stop the singing is the moment the glitter gets them.
Frequently Asked Questions
Can I sign the card before it activates?
Yes. You can safely sign the card and it will play one-time. Close the card and it will stop.
How long does the song play?
Once activated, the card plays continuously for 3 to 6 hours until the internal battery dies. There is no off switch. Please note; batteries are like a sponge so if they open it again you'll get more music.
How do I activate the card?
We suggest inserting the card into the envelope first the remove the instructional tab from the spine. The moment your recipient opens the card, the song (or sound, depending on your design) starts playing automatically and won't stop until the battery dies or it's broken.
How do I stop the song?
Once activated there is no off switch. The song plays until the battery dies. Attempting to destroy the card triggers the hidden glitter (or in some cases the glitter is found when the pull strip is removed). That's the prank.
Does the card come with a Glitter Envelope
No. All cards ship with a plain white envelope. The glitter is already built inside the card itself, either hidden inside waiting to be unleashed or behind a pull-strip reveal. If you want the full glitter ambush on the outside too, we sell Glitter Trap Envelopes separately.
