VELLEMAN PS1805ACU NON-REGULATED SINGLE-VOLTAGE ADAPTER - AC INPUT AC OUTPUT - 18 VAC / 500 mA C-UL-US approval voltage: 18 VAC current: 500 mA input: 120 V AC / 60 Hz type: non-regulated AC plug: 2.1 mm x 5.5 mm weight: 14.4 oz dimensions: 1.825" x 2.125" x 3.375" cord length: 5 ft. Class II power supply