Products with solar cells

Can anyone comment on why we do not see more portable products with
solar cells? I have not seen an mp3 player with a solar cell. Are the
solar cells not cost effective for mass production designs? Do they
have any Rohs issues? The only place that I have noticed them is in
calculators. I would imagine many mp3 players could run on 1mA. would
you need to large of a solar cell to keep a battery charged for a
device that used 8mAH per day?

Thanks,
James

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