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This is AC 110V / 220V to DC 9V power supply adapter. It is particularly suitable for wireless router£¬ Arduino DIY£¬ breadboard power supply and other projects. - Power Supply: AC 100~240V - Input Voltage: AC 100~240V - Output Voltage: DC 9V - Output Current: 2A - Input interface: US Plugs - Output interface: DC jack 5.5*2.5mm - Wire length: AC 50cm£¬ DC 80cm - Conversion efficiency: 85% (Max.)