Involvement:Expert (understands the inner workings) - Ownership:more than 1 month
This is a very thin calculator I've ever seen. There are many low cost for such preparation. No need to change batteries, because it works without batteries with solar panel made ??very simple.This is already calculator.It is very convenient, can be used by everyone in the family, even by small children.
The problem is that it should keep the display and solar panel to break.
You can carry it everywhere with him as you put it in your wallet or purse even in your pocket. Gift is very appropriate.
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