The Explorer 320 is and excellent product: inexpensive, high quality, and easy to use. This is the second one I've had. Somebody stepped on the first one. Unfortunately, it was shipped without any enclosed operating instructions or a warranty card. Fortunately, I still had the operating instructions from the other one I had, and I decided to take a chance on not sending in a warranty. But, if I hadn't had the instructions, it would have been impossible to set the thing up.