The easiest way is to buy from a High street shop or from Casio on Amazon. There are so many fakes on eBay and in other places online. If you buy from a shop only accept one in a box.
If you have already bought one push down all the buttons at the same time. The display should show 88:88, Also hold down the 24HR button for a few seconds and the words Casio should show on the screen.
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There are a number of retailers both online and in store where one can purchase a Casio CDP 100. They can be purchased from Amazon or from ebay either used or new.