Need small digital countdown timer?

I'm making a time delayed jewelry box for my girlfriend and I can't seem to find what I need. There are plenty of digital countdown timers but they're all too big. It needs to be VERY small. Like the size of a cracker. I don't even need the display, just the timing mechanism. It also has to have... show more I'm making a time delayed jewelry box for my girlfriend and I can't seem to find what I need. There are plenty of digital countdown timers but they're all too big. It needs to be VERY small. Like the size of a cracker. I don't even need the display, just the timing mechanism. It also has to have some kind of alarm or action when it hits zero so I can trigger the box to open. Also, it has to countdown for about 6 weeks and run on a small battery. Any ideas on where to find it or how I can make it? Thanks
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