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Features: Input: 100-240VAC 0.25A 50/60Hz. Rated Power: 30W. Output Voltage: 3V 4.5V 5V 6V 7.5V 9V 12V, manual adjustment. Move the switch to the output voltage you need, then connect the power. Used for moblie phone, tv box, repeater, computer, game machine, and other electronic equipments.