wireless [SEP] purchased for hubby who does tattoos and he was so surprised it is cordless and actually works he was worried it would not hold power but it is motor is or and it has a battery that allows you to work for hours it has an overcharge protection so if you put it on charge and it finishes it will not ruin the battery it also has short circuit protection and temperature control it has a digital lcd screen that is shows you the display in hd it is lightweight and easy to take anywhere with you to tattoo where it is clean and safe to do so