The bell box to press (ie the transmitter) must be filled only with batteries. The box has the dimensions 4.5 x 7.5 cm and 1.5 cm thick. This can contribute readily. Of course, you can be anywhere firmly fix or install with the supplied plugs and screws permanently it also with the supplied 3M tape. The range is 200 meters. The button is large enough that it can see or sensing also an older or visually impaired person. One can enter the ring box in a umhängbare card pocket, so it has the needy at all times.
The reception box itself is 7.5 x 8.5 cm in size, has a depth of 7 cm, including the power plug. That a current connection here is a very great thing. So you can the receiver anywhere into the wall socket where you need it. This ensures a certain mobility in the house and in the garden. The volume is adjustable with a side button, also you can choose between 48 melodies.
A very fair price, an ingenious solution and easy handling. I am happy to give for this great idea 5 Stars.