One card costs $15, two cards cost $25, five cards cost $55 and 10 cards cost $105. Shipping is included in those costs if you live in the United States. The brothers have several pro tips for buyers.

At the same time, four blue LEDs pulse to the music, lighting up the words that are engraved in the plastic. Posted in ATtiny Hacks Tagged acrylic , attiny85 , birthday , card , edge-lit ...

The cards (still available for a pledge of $15/£10 online) are delivered in ‘safe mode’, which means you can start and stop the ‘jaunty’ happy birthday tune as much as you like.

But for one baby, they're absolute musical magic.The baby in this clip received her very first one for her very first birthday, and her happy dance says it all.As "The Hamsterdance Song" plays ...

Beginning Friday (May 10), Facebook users can add digital cards, photos and videos to Stories to celebrate the birthdays of friends and family, the company has revealed to Billboard.

The "cards" show a video of Dolly dancing around a sign of the recipient's name -- and singing a birthday version of "9 to 5." ...

She can’t stop dancing to the funny tune inside her birthday card. — -- They say the best gifts come in small packages, and it seems this baby would have to agree. Take a look at adorable ...