Other than the obvious (TFT screen and sensor cradle), I can't find any information on the TS408.  I just got a TS401 from Amazon, and when unable to register it as the support site had no option for it.  However, I did see TS408, and tried to use it, but the serial number couldn't be matched.  I sent support an email asking about this, and searched their site and this forum for info, but nothing.