I had the Nexx wired garage door unit and was excited to upgrade to the wireless one. Unfortunately the transmitter that attaches to the door frequently gave the incorrect door status. I tried several suggestions given by Nexx Help and continued to have the same problem. They just would not send a replacement transmitter. I finally purchased my own replacement and it appears to be working correctly. Just goes to show the original one that came with Nexx NXG-200 was defective.