Like all those new hallmark ones
How long do those singing greeting cards last?
some of those cards have a tiny battery that last. from what i remember, i received a birthday card dated 1991 from greece and i know it still play the tune, probably its rare that i open it up...so maybe it depend on what is the battery lifetime and how 's the quality made.
pretty sure hallmark is the top of the line and it will be great to listen to it once in a while and that will preserve the battery.
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