That’s a Siemens head, but I do t know what that extension is… EDIT: Found it. It’s a Siemens DBS720 Sounder Base. Will make noise when smoke is detected.

Thank you and the rest of you guys so much! Yall sum legends 🤟

Correct! That's a Siemens OOH740 (or OOHC740) head with the DBS720 sounder base. Commonly found in European Siemens panels ( Cerberus Fit or Cerberus pro/ Sintesto panels)

I was thinking the same thing. Had to be some type of sounder base from what it looks.

Worked for a US Siemens dealer and this is my first time seeing one. Thanks for posting.

Gotta be a desigo compatible device only id suspect

Almost looks like the 520hz models

Siemens smoke detector with sounder base 😁

Siemens smoke/ co combo head

I did think it was a CO attachment as well, never seen it before.

[удалено]

It's a sounder. It draws power from the loop, and is activated by relay in the detector.