This item is a pre-owned, used, and refurbished to full capability. It is a Synrad brand air cooled laser 25 watt 48-2 model. It fits as a replacement for  INTELLIGENT LASER SYSTEMS II, a.k.a. ILS-II, and also the ILS-III-NM 25W model laser engraving machines with a 25 watt laser.  It is the same laser as is installed in the machines, and gas refilled.
 
One year warranty on this laser.