What first strikes: after just 10 meters and through a small drywall there is no reception. so has with us to use already done. neither the pattern, nor the volume of the gong can be adjusted. the "only-light" mode light up pointlessly the blue part of the receiver permanently and blinks when pressing the button for some time (instead of the light standard skip). the annoying especially if it is dark in the room. otherwise you have the recipient namely always have in mind as the blue light is otherwise unremarkable.
overall disappointing product.