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Installation was very easy, with the exception that my transformer only provides 10V, and it initially did not work. Itconnected and installed fine, the button light went to a steady blue, but as soon as I pressed the button, the led colorwould change to Green and the chime would "try" to sound but would cutoff immediately. I thought I needed to install theadapter that came with the unit, but when I checked the voltage on my transformer, it was 10VAC, and as I pressed thebutton, it would come down to about 9. 75V. So, I went to my local store and got a 36V Center tap transformer to replace the10 V one, using the center tap to provide 18VAC. When I got back from the store, just in case, I pressed the button on theGREET, and it worked fine with the original 10VAC transformer. I waited a few minutes, and tried again. Worked flawlessly. I tried it several more times with the same result; so I decided to leave the 10VAC transformer, and return the 36VACtransformer to the store it was a lot bulkier than the original one, anyway. The following weekend, I travelled to China,and used the greet to answer my door, and to communicate with my wife and kids, whenever they were at the door. The devicehas been working flawlessly ever since.