A wide voltage range is acceptable, from 10.5 - 17VDC rated at 70-100mA (or more) with a miniature coaxial connector.  
 
Actual measurements are 55mA @ 17.5VDC (approx 1 W) and 50mA@12VDC (approx 600mW)
 
Important: Make sure the center contact of the connector is positive. If you use the wrong polarity, a choke will burn out and need replacing, but the rest of the unit will be intact.
 
(Message edited by mica on July 24, 2015)

Look for a graphic similar to this:
 

The diameter of the connector is 2.1mm