I purchased this product to provide caller ID for an old speakerphone that I really like. And I had no problems with the main functionality. That is, on the second call, information about the caller is displayed. It also has another benefit that I didn't think of when I bought it: it displays the exact date and time, which is synced with every call. This is a watch that needs no adjustment. My only complaint is that the display is difficult to read at times. As others have pointed out, most of the time you have to look straight ahead to read things clearly. The default angle of the device didn't work with my setup. I had to brace it with a homemade wedge to be able to read it from my work chair.
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