Do you think this is a credit card at your first sight? Actually this is a solar power calculator. You feel surprised right? This solar power calculator uses solar power which is energy saving and environmental protection. This handy pocket credit card calculator works great without batteries.This is an environmental Pocket Calculator; The Best Calculator is made of high quality material, durable enough for long time using. At the same time, the Pocket Calculator has basic calculating function and can be used for daily calculation at home, in office and so on. The Solar Power Calculator does not need batteries, which will save energies. This Solar Power Calculator is portable for daily using. So what are you still waiting for?