Door intercom systems consist of a station at the entrance to a dwelling or building and one or more receivers in the dwelling, apartments or offices. They are operated by pushbutton at the entrance and by either a pushbutton, telephone handset or handsfree unit within the building.
A wireless door chime that chimes and flashes when the door bell rings. It consists of a push button transmitter and a receiver that plugs into any powerpoint. The transmitter is battery powered.
A battery operated door chime that can be used as a security detection device. It senses any object moving in front of it to a distance of up to five metres. It gives a 'ding'dong' sound and has an in built traffic counter. The unit can be mounted on a wall or a hanger.
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