The Magnetic DaysAgo features a strong magnet that snaps securely to most metal surfaces. It is perfect for jar lids and refrigerator doors. The DaysAgo Digital Day Counter is the first and only digital day counter that attaches to a variety of surfaces with a magnetic or suction backing and counts up to 99 days. It’s a simple gadget that is re-usable, versatile and helps save money. You can use the household timer in the kitchen, garden, garage, or any number of places. Place it on food containers to let you know how many days ago you opened it, closed it, tried it, sauced it, grew it, etc. As for leftovers, it eliminates the doubt about when to throw it out.