Very frustrating company. I needed a replacement "manual" which consisted of two sheets of heavy blue paper, printed by computer. They charged me $15.00 plus $4.00 shipping, as they sent it UPS. I thought they had a couple of post offices around the L.A. area. My brother called them with a serial number, to find the age of a unit and was told that piece of info would cost him $35.00! That said, I still wouldn't give up my Data Basic II nor my balanced Gen Va.