AC to AC Wall Adapter Transformer 18 Volt @ 1000mA Black Straight 2.1mm Female Plug Output Voltage (VAC) : 18 Output Current (mA) : 1000 Output Connector ID x OD : 2.1mm x 5.5mm Size H x W x D (inches) : 3.1 x 2.7 x 1.9 Input Voltage (VAC) : 120