HeTest PS-28 2 Amp Single Output Variable Power Supply (Support 6 Switchable Voltages) Output voltage: 3V,4.5V,6V,7.5V,9V,12V Output current: MAX. 2A Ripple and noise: CV&lt;10mVrms Protection: reverse polarity protection, short-circuit protection Dimensions: 6.5"D x 2.25"H x 4.0"W