The Aegis Max Box by Geek Vape is an electronic mod which functions with a 21700 battery. The most robust of boxes has a capacity of 21700 conserving the compact size and ergonomics. The Aegis Max is a box does not fear water, dust, shocks with the multiple solid covering. This is an all ground box by excellence. The Aegis Max is the latest single-battery box mod from the popular manufacturer Geekvape. By now, most vapers know who they are as they`ve made some great products over the years. They`re a very solid and reliable company overall. The Aegis Max is the latest in a long line of Aegis products.