The Tesla Invader 2 Classic wood mechanical box mod is designed to fit perfectly in your hand. This one has smoother corners than the original and this new “classic” design just looks better all around. They are marketing it as having a US made MOSFET switch so you can be sure it’s reliable and the Tesla Invader 2 is built to last. Another great feature is the magnetic battery door so swapping out your batteries is a breeze.