GPK Systems&reg; Ac Adapter for Asus Zenbook Ux21, Ux21e, Ux31, Ux31e, Ux21e-dh71, Ux21e-dh52, Ux21e-kx004v, Ux31e-dh52, Ux31e-dh53, Ux31e-rsl8, Ux31e-ry012v, Ux31e-ry003v, Ux31e-ry009v, Ux31e-xh51 Thin Light Ultrabook Power Supply Cord Input: 100 - 240 V (worldwide use) Output: 19V 2.37A Service & Support 1 year warranty Use minimal power this adapter is designed to save energy Replacement power supply AC power adapter was tested to match and/or exceed original product at low price.