Warranty on Keyfob 4 button transmitter

I purchased 3 of the 202U remote systems, and have installed 2 of them. They work exactly as advertised. When installing the 3rd on, I noticed one of the 4 button transmitters did not work, as the battery was dead. I put a new battery in and it worked fine, for about 3 days. The battery was dead. This has happened twice. I think there is a short or similar problem that eats up batteries. What id=s the warranty on the transmitter and how do I get it replaced?

Sorry for the inconvenience, I have contacted you via email regarding order number etc.
I have also let engineering to track down the problem to make sure it doesn’t happen again in future.