Fire alarm with a transmitter spaced from a receiver through a colored sheet

A fire alarm (1) comprising a flush-mounted installation outlet (1.4) for installation in a ceiling, a base (1.5) connected with the flush-mounted installation outlet (1.4), a fire alarm insert (1.1) connected to the base (1.5) and carrying a radiation receiver (1.2) and a radiation transmitter (1.3) which are spaced from one another, a covering cap (3), and a sheet (2, 2.1) having a color substantially corresponding to a color of the ceiling, spaced from the base (1.5) and located between the covering cap (3) and the fire alarm insert (1.1) to cover the fire alarm insert (1.1), wherein the covering cap (3) has a recess into which the sheet (2, 2.1) is inserted, and wherein the covering cap (3) is transparent to expose the color of the sheet (2, 2.1), wherein the transmitter and the receiver provided on the insert (1.1) extend through the sheet (2, 2.1) to the transparent covering cap (3).