This device simply takes the voltage from the phone line to light the bright LEDs. The like will brightly flicker with each ring. During the day, I suggest pointing the light toward the viewer(s). The reflection cannot overcome daylight/office lighting. At night, it can be pointed toward the ceiling so the flash is less harsh. I use it in a loud room where I may not hear the phone ring. In a quiet room, I have the ringer muted and let the flash signal a call. The unit could be improved by having non-permanent mounting (such as magnetic) and having the 'unit out' port on the same side as the wire in. Better yet, have a 'unit in' port with a short wire accessory.
Rating:
[4 of 5 Stars!]