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Date: Fri, 14 Nov 2003 16:52:15 -0500
From: Bob Johnson <>
To: Kurt Seifried <>
Subject: Re: Re: Serious flaws in bluetooth security lead
 to disclosure of personal data

Kurt Seifried wrote:
> Actually there are three classes of bluetooth:
>  Class 3 with with 0 dBm (1 mW), 100M or so range (usually as a seperate
> dongle, not many devices have this capability built in as it eats batteries,
> however several "base station" products do it).
> Class 2 with 4 dBm (2.5 mW), 10M or so range (the "usuall" one)
> Class 1 with 20 dBm (100 mW) 10cm range (i.e. physically next to something).

Ummm, why does the range go down as the power goes up?  Should there be 
"-" signs in front of those dBm values?  Or are they listed in the wrong 
order?  100 mW should get you a lot farther than 10 cm if you have any 
antenna at all.

- Bob

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