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Doorbells with one pushbutton are ideal for residential locations while doorbells with two pushbuttons are ideal for commercial locations with more than one entrance.
A dual chime is a distinctive sound to distinguish between the front doorbell and back doorbell.
A UL listing indicates that an electrical device has been tested for safety and quality assurance, and is safe for public use.
A doorbell transformer will lower the electrical current to about 10 to 20 volts. Most household circuit panels can handle 120 or 240 volts.
A doorbell is a signaling device that is typically placed near an entry door to a building. When a visitor presses a button, the bell rings inside the building, alerting the occupant to the presence of the visitor.