Flush-mounted secondary ring tone device The secondary ring tone device with capacitor and optical display is used as an additional signalling device for telephones installed in indoor areas A telephone with TAE connector (F coding) can be connected directly to the secondary ring tone device. https://elecena.pl/product/18679661/wk-958-up-ring-tone-secondary-device 2021-06-06 https://elecena.pl/product/18679661/wk-958-up-ring-tone-secondary-device 2022-01-31 https://elecena.pl/product/18679661/wk-958-up-ring-tone-secondary-device 2024-07-29 https://elecena.pl/product/18679661/wk-958-up-ring-tone-secondary-device 2025-04-02