Thanks for the replies all. I have been so busy the past few days that I haven't checked yet! I have the receipt from the purchase, but will check the battery compartment. Its an expensive toy that if stolen or ends up burning in a house fire etc, I plan on having it replaced if that ever happens. My insurance policy will cover against theft, fire etc, but I need to document serial numbers and I am even going to the extent of photographing everything as further proof of ownership and I think all of this will end up in a safety deposit box. Does anyone else do this?