500mW Square High-power Blue Violet Laser Adjustable Focal Laser head
Wait for it… wait for it…
2 prohibited for children to play.
I didn’t see anywhere says engraving or cutting. Seems like children toy with 5V power supply. 
its only good for poping balloons or other non engraving stuffs.
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Overclocked diode:
http://www.ebay.com/itm/Osram-405nm-350mW-600mW-Laser-Diode-Violet-Laser-Diode-3-3mm-/141042733863
Can’t work in higher ambient temperature than around 30 degrees because of the very small package TO-38.
Of course diode can bear 70 degrees but measured on the golden ring what is hard to provide without soldering the diode to the case.
those diodes have to have a heat sink or they will burn out.