the new mad mod kit from desire is a simple mid-level starter kit that provides a good base platform to begin vaping. coming in at around six inches, this is a semi-compact device that fits comfortably in the hand. with its integrated proprietary mad mod 108w chip you're protected from a plethora of issues including low voltage, over charging, and short circuiting. the mad mod box is milled from aviation grade aluminum and features an easy to use .96" o-led display screen with one fire button and two small setting adjustment buttons. under the spring loaded rebound battery cover the device fits 21700 batteries as well as 18650 batteries with the included battery adapter.