That is a diode pressed into an AixiZ module. The M140 diodes are good to 2+ watts at 1800mA driver current. Above that you'll have to get another diode, but be careful as some have terrible divergence specs.
That isn't a bad price for a working module with the diode already pressed into it. I don't know which diode they are using as it could be anyone of a number of different diodes. If it is truly outputting 3 watts it isn't an M140. They are good to 2+ watts at best.
Thanks for all the help. I will have to see about ordering a whole module. I was hoping to save money. I was etching wood and all the sudden it stopped etching. I tried vinyl and it was burning it but not all the way trough.