things you cant loose

Nowadays there are different products in the market that solve this problem. Using rfid signals, the product beeps when you get away X meters from an objetc. Think of two keychains that when separated more tahn X meters beep.

This product is good for car keys, cell phone... for documents and other things I suggest you have everytinh copied: 1 hard copy, 1 electronic copy in a safe place (internet storing space, email, lock...) and 1 electronic copy on a solid media, sucha as a hrad drive, pendrive...

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