Deigned by Juan Puente, This power supply automatically switches internally for different electrical outputs (110-240) so that you don't have to worry about converters while traveling or at our work station in another country. The plug is your standard 3 prong that is used internationally. The 2 voltage buttons on top make it easy to cover, keeping it clean. 15volts is the maximum power. There is a one year guarantee with this as well, this offer is void if there is extreme abuse. These are only available to Tattoo artists working in shops, if this is a gift please send an email before purchasing.