I need a prototype of an idea of mine created, but not sure if this is done on iFreelance.

It looks something like this:

Aprox. 2 in or less in height and width
Under .5 inches thick
Has multicolored LED lights
A button in the center that is flush to the surface, or the front is slightly flexible that when pushed LED lights will flash for about 10 seconds and a sound will play for 10 seconds

It will velcroed on to childrens PJs so no sharp or pointed edges
It needs to be able to be opened in the back to replace batteries and it needs to hold as many batteries as possible.