MAGNETIC 3A Power Supply For Tattoo Machine 
3.4A Powerful continuous current - Jumpstart for hard tattoo machines or cartridge needles. (it can be switched off) - Multi Colors: the light colors changes following the voltage changes - Magnetic pad so you can attach it to a steel metal surface -True continuous 3A output, Maximum peak current: 3.4 Ampere - Multiple modes: maintain mode or normal mode, or you can use it without a foot switch