👉 The handline is a type of communication device that allows users to communicate using only their hands. It consists of a microphone or speaker, along with buttons and other touch-sensitive elements. The user can use these buttons to send messages or commands, which are then relayed through the line to a central processor. In terms of technology, handlines have been used for centuries in various forms, including wireless telephony systems such as the Enigma system, and voice-over-IP (VoIP) services
