2.8 cm (1.1") small loudspeaker with plastic cone and round plastic basket. Small size, therefore suitable for signal output in devices where space is limited. The connection is made via spring contacts on the rear. Technical data https://elecena.pl/product/18519273/2830-miniature-speakers-28-mm-1w 2021-05-20 https://elecena.pl/product/18519273/2830-miniature-speakers-28-mm-1w 2023-07-12