I purchased this doorbell as I really enjoyed that it had so many different ring tones. And after attaching the button to the previous doorbell button location with a screw and double sided tape I began playing with it. I plugged the two receivers into a nearby outlet and began pushing the button to cycle through the different ringtones. When I then went to test it by pressing the doorbell I noticed it was still going with the original tone. That is when I went back to the instructions and noticed the part about syncing the button to the receiver. I thought that was not needed as the doorbell was working out of the box. That is when I noticed where i had to hold down the volume button then I had 5 seconds to reach the doorbell and press it to sync it. Since I had already mounted the doorbell this meant I had to plug it in as close to the door as possible and race over to press the button. And by the sounds of it, if I want to change the ring tones I will have to do this every time. I thought I could just change the ringtone at the receiver at will by just pressing a button. My previous WiFi doorbell which mind you only had like 12 tones allowed me to do that.PROS:1. Easy to setup2. Inexpensive3. Many tones to choose fromCONS1. You need to sync the doorbell to receiver anytime you want to change a ringtone(unless I am missing something)2. You have 5 seconds to pair the receiver to the doorbell and need to do so with each receive.3. Some of the doorbell chimes are very tinny sounding(of course the receiver has a pretty small speaker which may be part of the issue)4. Seems like most of the chimes are too short and you may not hear them unless the person holds down the button. And the ones that are longer, also seem to be WAY too long.All in all, this is a good product to replace a doorbell that has gone out on you with not too much hassle.
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