RFID keychain alert device

[jnavtx at gmail.com (John Navarro)]

http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/rfid/List/0/SortField/4/ProductID/517/Default.aspx
<http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/rfid/List/0/SortField/4/ProductID/517/Default.aspx>small
enough?

On Tue, Aug 18, 2009 at 2:56 PM, James Costello <genesiswave at gmail.com>wrote:

> Does anyone know of a device that could be used to alert when there are
> RFID sensor around?  Something small, about the size of key fob.
> Something that might be good to have at say a computer security conference.
>
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