One consideration is FCC section 15.103(h)
http://www.hallikainen.d2g.com/~harold/cgi-bin/section.pl?section=15.103

    (h) Digital devices in which both the highest frequency generated
and the highest frequency used are less than 1.705 MHz and which do not
operate from the AC power lines or contain provisions for operation
while connected to the AC power lines. Digital devices that include, or
make provision for the use of, battery eliminators, AC adaptors or
battery chargers which permit operation while charging or that connect
to the AC power lines indirectly, obtaining their power through another
device which is connected to the AC power lines, do not fall under this
exemption.


Harold



FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

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