More details from Littlite (www.littlite.com):
The company’s CC circuitry converts input voltage of 5-28vdc and feeds 12-Volt to the LED. Users can power the ANSER from the company’s standard 12-Volt external power supply (included) or any other source of 5-28vdc power. As a bonus, the ANSER can be powered from most USB ports (subject to available current at USB port).
The ANSER is available as a free standing Desk Light built into a modified cast weighted base or as a lampset capable of a variety of mounting applications and compatible with all of our usual mounting accessories including the new MP-III flush mount plate.