What is the CLASSIFICATION of a sound signaling apparatus imported with two components, Part A and Part B, that is battery operated, wireless, and has the following additional characteristics? Part A is a chime unit that is placed inside a home no more than 150 feet from an exterior door. It has a radio frequency (RF) receiver. Part B is a backlit button that, when pressed, sends an RF signal to the receiver in Part A, resulting in a chime sound. Part B is placed outside the home near the exterior door.
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