The Magic Dot Box is a great tool for creative ways to make dotworks etc. Basicly you can adjust the on and of signal from 0,1Hz to 150Hz to create patterns with your tattoo machine. 

Turns any tattoo machine into a dot machine with a clipcord. Simple to use. One button to turn it on/off and adjust the speed by turning the wheel. Connect the Magic Dot Box to the powersupply and connect your clipcord to the Dot Box then your good to go. Bypass mode available when you're tattooing in normal mode. Simple and very very fun! 

This is NOT a power supply. You will still need a power supply to get this device work.