You can record whatever you want on the module as long as it's no longer than 20 seconds. It sounds remarkably well considering the size of the speake...
Just in time for Valentines Day! There are plenty of secret hidden compartment book projects but I added a special high-tech bonus feature that has never been done before!
Step 1: Get a book!
If it's anything like the book I found in the used book store, you will want to read it cover to cover. After that, using a ruler mark off a decent sized square area and cut it out all the way to the back cover using an X-acto knife or razor blade(s)