noun
listener, receiver (phone/handset)
B1
Hörer is a German masculine noun with two main senses: 'listener' (audience member) and 'receiver' meaning telephone handset or earpiece. Article der; plural 'Hörer' unchanged in form. Genitive singular 'des Hörers'. Context determines meaning; use 'Hörerin' for a female listener. No special preposition is required. Common in media and telephony.
Examples
Der Hörer des alten Telefons war zerbrechlich und lag auf dem Tisch.
The receiver of the old phone was fragile and lay on the table.
Die Sendung enthielt Musik für die Hörer, damit diese sich nach der Arbeit entspannen konnten.
The program included music for the listeners so that they could relax after work.
Viele Hörer riefen während der Sendung an, um Fragen zu stellen.
Many listeners called in during the show to ask questions.
Details
Mnemonics
Imagine a person holding a radio headset to their ear — that person is the 'Hörer'.
sounds like 'hoor-er' — think 'hear-er' (one who hears = listener)
der = male/person; remember 'der Hörer' refers to (male) listener or the male-gendered noun.