This is a professional quality power supply set. 

The supply box can be used for dual machines with both machines attached at the same time.

Input Voltage : 110-240V AC50/60HZ.

Output Voltage : 1- 20V (adjustable) DC 15V 1.5A.

Rating Current 0-1.5A

Working Temperature -20 ~ +45

Storage Temperature -20 ~ +85

Relative humidity 5% ~ 95%

Waves ises < 100 mV

Shell: top steel

Output power: 28 W

Overoload Voltage Protection: 120% min

Overoload Current Protection: 120% min

Output Voltage Accuracy 5%

Package Include:

1 x Tattoo Machine Power Supply

1 x Power Cord (fit for your countries)

* If you are using rotary, parameters on the screen is usually not correct but other than this it won't be a problem at all.