dual power supply, There is a screen film on the screen to protect the screen so you can peel the screen protector off from the screen then you will find there is no scratch on the screen.[ [Convenient to carry] Lightweight, unit weight: 650gInput voltage: 90V-240V, AC50/60Hz. Output Voltage: 3-18v. Output Power: 0.3-68W. Output Current: 0-3A, accuracy 0.1 A. Output current overload protection. Operating Temperature: 5 ~ 45 . Liner/ Shader presets with memory modes. Momentary (conventional) or Maintained (push on push off) foot switch modes. Easy one button toggle.PLUGIN IN THE POWER – Use standard adapter connect to power supply through “DC/19” socket.