Features: A compass perpetual calendar key chain key ring With a shining mirror on the back A small pushing handle on the compass for turning Great for oneself or as a gift to others Material: Zinc Alloy Color: Silver Ring diameter: Approx. 1.26 inch/3.2cm Compass(D x T): Approx. 1.69 x 0.16 inch/4.3 x 0.4cm How to use: Turn the upper disc, aligning the year and month you are to seek, then the diagonal direction will show you the week information of each day in the month You can know the week of every day in the range of 2010-2060 Black "S" means Saturday and red "S" means Sunday When you seek for January or February in a leap year, you should aligning with the red "JAN" and "FEB" Package Included: 1 x Perpetual Calendar Key Chain