It does what Is meant for, the small unit where you press the button for the device to ring can be attached to anything that can hold it by using the double adhesive tape included, I put mine on the metal screen door. Many ringers to choose from and different volume controls. It is not Illuminated and I will assume It is to have the battery last longer, makes sense. It does however have 2 or 3 Blue lights flash a couple of times when you press the door bell.
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