This compass calendar keychain is very creatively designed and fantastically crafted. Delicate perpetual calendar, also a great key with a decorative chain. Made of solid alloy, it can withstand long-term use. This compass 50 years perpetual calendar keychain is a great gift for yourself or others. Description:Perpetual Compass Calendar KeychainGreat Perpetual Calendar, Also Great KeychainThe Compass Marks Are Groove Filling Color, Not Easy To Fade Or Rub Off With Glossy Mirror On The Back Small Push Handle On The Compass To Rotate Great For Yourself Or As A Gift For Others Material: Zinc Alloy Color: Silver As The Picture Shows. Ring Diameter: Approx. 1.26 inch/3.2cm Compass (L x T): approx. 1.69 x 0.16 inch/4.3 x 0.4 cmUsage: Rotate the top plate by adjusting the year and month you are looking for, then the diagonal direction will show you the week information of each day of the monthYou can know the week of each day in the range of 2010-2060The black "S" stands for Saturday and the red "S" means SundayWhen you are looking for January or February in a leap year, you should adjust to the red "JAN" and "FEB"(please notice, that red "s"." JAN" and "FEB" can't be shown in the real item, I just know there are two Jans, two Febs, two s.)The product is new, never used and in good condition, just buy! Package Included: 1 x Calendar Key Chain