Can anyone tell me a good Voltage and watt adjuster of my firs box mod?

[bentandshallow]

Don't got to be nothing fancy. I'm building a box with duel 18650 in it I would like to install something simple to control volts and or watts. Thanks


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[BJ43]

Don't got to be nothing fancy. I'm building a box with duel 18650 in it I would like to install something simple to control volts and or watts. Thanks


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For just volt control.

http://www.e-cigarette-forum.com/forum/battery-mods/259577-just-lm2596-users.html

For volts and watts the Groove board is good and cheap...$11. I bought this one for a dollar more than the plain board, to get the pushbuttons.

http://www.hoosierecig.com/-Metal-Groove-PCB-and-frame_p_764.html