How can i tell what GPS tomtom one model I have?

I bought a used GPS tomtom one from my friend but i am not sure how to tell if it is a 3rd generation, second generation, or any other type? Is there a way to tell because the under side just says one.

look for a product id on it somewhere and then google it.

here's a gps for dogs.. lol

http://onlinesalesgarmingpsdog.weebly.com/

You can selection the best seller of Garmin from

http://www.nuvi660.lowprices-shipfree.com/

TomTom ONE have the SD card slot on the bottom with the map loaded on a SD card. The TomTom ONE 3rd edition does not have the SD card slot.

Hope this helps