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Although the same model of originally used model was in poor condition from the beginning, I thought that it was a losing item, but when I made it for a while, problems such as interruption and volume change occurred. Volume adjustment can hardly be used from the beginning, the absolute volume is also small, and this time I plan to buy things from other manufacturers. I can not recommend this model. (For now, this type has no choice, so please handle AT 406P made by Aiphone)
The ringing tone is small. Three-stage volume switch is attached, but there is not much difference in the volume. (In the first place, it is not felt the volume change that this volume is effective against the ringing tone or the calling sound or the difference is not understood either)