GLORIA RC-10

The detectors have a diameter of just 40 mm.
The aesthetically pleasing photoelectric smoke alarm has a 10-year battery life and warranty, a piercing 85 dB(A) alarm sound audible from 3 meters away, a 10-minute silence option, and uses the “Smart Clip,” a unique ceiling-mounting mechanism for installation.
Despite their compact design, the 40 mm smoke detectors meet the highest quality standards.