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Tegui 090021 identifies the EGF-21 audio module used in conventional Serie Europa door entry systems. It is an audio component of the entrance panel.
Do not assume that it is compatible: this product listing identifies an audio module for a conventional door entry system. Check the exact technology before replacing it.
Check that the installed part is marked with reference 090021 or model EGF-21, and verify its connection and panel.
This reference is for the entrance panel's audio module, not an indoor handset.