The set includes three bell receivers for the socket and two bell buttons that can be mounted on the house wall with adhesive tape or screws. The receiver has five adjustable volume levels with a maximum volume of 110 dB and a choice of 58 ringing melodies. The ringing is so loud that it can be heard from a few rooms away or from another floor (range 300 metres). There is no interference with other electronic devices in the vicinity. Different ring tones can be set for each receiver. The LED bell light is very suitable for the elderly and hearing-impaired and is also ideal for the care of the elderly or patients. Even after a power failure, the previous settings do not need to be reset. The transmitter works in both dry and wet conditions (waterproof and dustproof).