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.