explain:Compass calendar key chain key ringA great perpetual calendar and a great key chain decorationThe characters on the compass are filled with colors in the slot, and are not easy to fade or wearThere is a shiny mirror behindA small push handle for turning the compassPerfect for yourself or as a gift to othersHow to use:Rotate the disk above to align the year and month to be searched, and then the weekly information of each day of the month will be displayed diagonallyYou can know the week of each day during 2010-2060Oone "S" means Saturday, and the other "S" means SundayMaterial: zinc alloySize: ring diameter: about 42mmShipping color: silverShipment quantity: 2