Now you can have the best of both worlds with your Elecraft K2. When at
your station, just plug in your K2 to the K2 Twin and you are ready to QSO
with the KPA100 power amp and the KAT100 matching antenna tuner. When you
decide to go QRP, unplug your K2 and you are off to the field! Requires
presence of KIO2 module, firmware version 2.0 or greater in your K2, and a
20 amp power supply. No modifications are necessary. Note that the K2 Twin
only works with a K2.

K2 Twin includes KPA100 100 watt amp and KAT100 100 watt auto tuner in an
EC2 enclosure with connecting control and PC I/O cable, KPA100 power cable,
RF connecting cable and manuals. Unit was quality assembled by one of the
original K2 beta testers. Excellent condition cosmetically and
electrically.

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=5705867218

Thanks for looking.

Rick