The item is exactly what it appears to be.  Although you need a switch for the related diode driver and laser, any hobby store would have this.  I presume that the three pieces, when assembled, will provide a relatively powerful laser module.  I don't know yet; I don't know how to assemble the three parts, nor do I know if I need more parts to make the lasser function (I will need a battery or power supply and wire, connectors and solder.