Handsets is a term associated with telephones and may be used in a different sense depending upon the type of phone. A handset is essentially any part of the phone that is held in one's hand and has parts for listening and talking.
The two major parts of a typical handset are the transmitter and receiver. The transmitter is a microphone that transmit the speaker's voice and the receiver outputs the audio signals from the phone.
Since the 1920's, the transmitter and receiver were combined into a single handset device to be held in the hand for speaking and hearing at the same time. Previously a handset only incorporated a receiver, these were called receiver-only handsets and were used in candlestick telephones.
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