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:Compass Perpetual 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/3.2 cm Compass (L x T): approx. 1.69 x 0.16 inch/4.3 x 0.4 cm Usage: 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 2010-2060Black " Squa; means Saturday, and the red " Squa; means SundayWhen you are looking for January or February in a leap year, you should conform to the red " JAN" and " FEB" (please note that the red " s". " JAN" and " FEB" can't be shown in a real subject, 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 Keychain