Last year the remote temperature transmitter quit working on my Lacrosse digital clock/temp. I tried replacing the batteries to no avail. I recently bought a replacement transmitter, and it wouldn't work either. I decided the clock receiver probably failed. Then this thread came along. As it happens the "new" batteries I tried were 3 year old Duracells. They work perfectly in almost every other device, but not on those transmitters. After installing genuinely new batteries, I can now tell the temp outside the RV again.