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I have a need for a simple device which will function autonomously within the overall product. The device, once activated by inserting a watch type battery, will begin a delay process of 36 hours. Once the 36 hour delay is complete a midi song/alarm will sound and loop until battery is removed.
The device must be as thin and small as possible, but inexpensive is more important. Here is an example, but don't let it limit your imagination, the thinner and cheaper the better, also only one speaker is needed(the example shows two speakers): http://jarv.org/2011/11/custom-musical-greeting-card-for-less-than-5/