This Calculator is Made of Eco-friendly Plastic. It is Small, Portable & Can Carry Out the Basic Calculation. It is Shape Just Like a Credit Card So You Can Put It in You Pocket. It has Many Different Colors Like Pink, Green, Yellow, Purple & Black. This is Solar Power Calculator So It Can Only be Used in the Sunny Place. It is Great for Opening Ceremony, Birthday Gifts, Business Gifts, Advertising & Promotion, Anniversaries, Trade Show & Other Outdoor Activities. Also, There is an Imprint Area for You to Add Your Logo.