Working properly ... the plastic of the bell is not very good (seems brittle) but the chime works and what is the principal. The signal goes smoothly 30m, through an exterior wall and the walls of the house (quite thick). No problem after 3 days of use for sealing ..., will be seen to use. The screws are not top and I had to change them during installation, so I take a star. 4 melodies with adjustable volume ... the receiver can plug into any outlet in the house. Good value for money