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These are cheap chinese products, worth ~$10 in bulk on market.
I had the opportunity to test a batch of 20 green laser modules recently.
Each one of them behaved in its own way (some would fade after power up, some would increase output, some would flicker..) and almost none of them met the output power specs claimed by manufacturer (for continuous operation).
The problem with cheap green lasers is, their operating temperature range is very narrow, because they have couple of resonant cavities and they all line up correctly only at a single temperature point.
Properly temperature compensated units will cost couple of $100's (in bulk).
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