DC Tattoo Power SupplySpecifications: Durable metal chassis frame instead of other fragile plastic models. Includes a 13 dial Potentiometer with 120 220v conversion switch in back. The ultra bright digital LED screen display makes easier to read accurate readout. Allows tattoo artists to connect a Liner machine and a Shader machine at the same time ( 2 clip cords required). Outstanding stability: The supply box can be used for two machines with both machines attached at