How to change the sound of a motion sensor?

Instead of having the alarm that is built into it I would like it to play my own sound clip. I'm not sure what would be the best to put the sound onto, and how to wire the motion sensor to it.How to change the sound of a motion sensor?Storing the sound is the easy part; probably a blank sound-recording card from Hallmark will do the job. But without a schematic, it may be hard to guess how sound is triggered.

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