Continuously variable voltage of 0-15V for both AC and slightly smoothed DC. Long switch lift time means that voltage can be switched safely at full load without serious contact wear. Dimensions: 208 x 155 x 115mm (w x h x d). Input voltage 230V +/-5%. Output voltage – continuously variable by rotary knob from 0-15V, slightly smoothed (by 2200uF output capacitor) DC gives practical rms values of 0-15V at no load.