BA9SF-WW-12VAC product, 4 out of 20 didn't work, new product right out of the package. When I called customer service the person spoke poor English that was difficult to understand. They wanted me to return the defective items, wouldn't take my word for it. I decided it was not worth my time to deal with low-value returns, I just won't buy from them again. I identified the problem: the LED units actually work but the lead that attaches to the inside of the BA9 outer base is not soldered in, just crimped and the glue attachment can interfere with electrical continuity.