IPA: /ˈhændˌsɛt/
KK: /ˈhændˌsɛt/
A device used for making and receiving phone calls, typically shaped like a handle and containing both the speaker and microphone.
He picked up the handset to answer the call.
Handset → It is formed from "hand" (from Old English "hand", meaning the part of the body at the end of the arm) and "set" (from Old English "settan", meaning to place or put). The word "handset" refers to a device that is held in the hand and used for communication, typically a telephone or similar device.
Think of holding something in your 'hand' and 'placing' it to your ear to communicate — that's what a handset is.