They said call Avad and get a replacement, so Avad sent me 2, and I sent 2 back to avad with a RA. Let me clarafy. RTI said send them in for repair, I said that wasn't an option, as i can't have my client not able to operate his gear until they send them back. (if you are a control company, you have to understand that) Avad billed me for the 2, but if I don't get a credit on the 2 I sent back, there will be big problems. I'm sure they will credit me. I of course ate the shipping both ways.