24 Qty MUSIC and LIGHT Birthday Song Cards with Inside Design – 10 Unique Designs Bulk Box Set, White Envelopes Included – 5.7 x 7.9 Inches - Perfect for Kids, Toddlers and Girls

Pros: Most of the designs are pretty nice.Cons: Two of the cards don't play. Three have sing marks around the wiring and two were dammaged on the face of the card. Also, the song is really high pitched and kinda annoying. The envelopes are very thin.In essence I do not recommend this product. Sorry, just being honest.

Very high pitched electronic musical song of "Happy Birthday to you.." . Some cards were playing continuously - we sent back because batteries were dying and the sound was seizure inducing. Pretty card, though. Just need to improve the musical aspect of it.