Brother @GolamMostafa, What do you mean by this? I can't understand your above speech. Please let me clear.
Do you mean I am trying to make a commercial gadgets with help of this forum?
Basically I am an under graduate student of a university. My teacher gave me a project and he advised me to do something which is not exist and also will help the people.
So I decide to do this. Because I think there was no gadgets like this one . And also it will help the Muslim people Insha'Allah.
When I will finished this, Insha'Allah I will give some copy to my nearest mosque and people for totally free.
But as I am not a rich man so it is quite impossible to give this gadgets to all of the mosque of my country and people.
In this situation if people wants this gadgets they can collect this from me at a cost (which is needed to build it).
For this I also trying to build it at low cost as can it possible.
And if it is illegal to ask for designing commercial gadgets like this one I am sorry for that.
Thanks to all for helping me.