Perpetual, three-month, wall calendar system helps you plan and organize three months of activities, schedules and deadlines. When a prior month's information is no longer needed, simply take that panel out, slide the other panel over and add the newly updated panel to the end of the system. Build a six-month planning system by placing two planners next to each other on a wall. Each system includes three monthly planner dry-erase panels that slide in and out of frame for easy writing and updating. Stain-Free Total Erase surface always wipes clean. Full-size tray holds markers, erasers and other accessories. Yearly calendar strip can be placed above panels for easy reference of upcoming dates. System includes mistake-proof "Easy-Mount" hanging system for easy, accurate installation. Calendar is compatible with Quartet Prestige 2 accessories.