loudspeaker

noun
1
a piece of equipment that changes electrical signals into sound, used in public places for announcing things, playing music, etc.
بلندگو, اسپیکر
see also public address system, Tannoy™
2
a function on a phone that allows you to hear without holding the phone to your ear
بلندگوی تلفن, اسپیکر گوشی
She used her phone's loudspeaker to let everyone listen.
The phone was on loudspeaker so I could hear both sides of the conversation.
3
the part of a radio or piece of musical equipment that the sound comes out of
بلندگو, بلندگوی الکترونیکی
synonym speaker