Used AC-to-DC adapter. Input 100-240 VAC 50/60 Hz 0.18A. Output 12.0 VDC 0.5A center positive. Output is via a 6-foot cord terminated in a 5.5mm (O. D.) concentric barrel plug. Tested and working. Pick up at our house in Derwood, between Rockville and Gaithersburg (near Briardale Road). [0fs]