Madvapes now has a variable voltage regulator board kit that makes creating your own variable voltage box mod a breeze. Their ICs and Regulators section now has not only 5v regulators, but a complete regulator assembly that includes the board, regulator and resistors. Just add a box, switch, connector and batteries of your choice and you’ve got everything you need to create your own variable voltage mod. Even with a charger included, it’s a variable voltage electronic cigarette for less than $30. Gotta love that!