Looks like battery operated devices operating at less than 1.705MHz are
exempt. See http://www.hallikainen.com/FccRules/2006/15/103/

Harold


> On 1/30/06, alan smith <micro_eng2@yahoo.com> wrote:
>>
>> If a device is battery operated, low clock frequency (under 1Mhz I
>> think)
>> are there any agency approvals that are really required?  I've seen some
>> products marked UL even tho they are battery powered.  Yes, this would
>> be a
>> consumer device as well.
>
>
> If I remember right, the clock frequency limit for part 15, is something
> like 9kHz, with an exemption for digital watches at 32.7 kHz.
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