The JR103DZ is a body only 10.8v Recip Saw that is part of the new Makita CXT range.
The CXT range is a new compact version of the 10.8v range which new features 'slide on' batteries that are very similar to the standard 18v batteries that we're used to. This new range offers improved higher capacities , with better durability and useability over the older 10.8v tools.
This ligthweight range has reduced perforamce over the 18v range, but because of the size and weight of it this entire range is perfect if you are going to be on the tools a lot but not nessesarilly using the hardest material.
Compared to the old 10.8v recip saw the JR103DZ has some handy new features or improvments. Firstly it has both a tigger switch and a paddle switch, which is a multi-position switch giving the user a greater amount of comfort and control.
CXT - Compact eXtreme Technology