This product is no longer available in Europe but a possible alternative is the miniature BRK DICON SA410LLI Interlinkable Photoelectric Smoke Alarm with "Alarm Pause" & Lithium Battery.
See related items below.
The Dicon 440 SRIM photoelectric (optical) smoke alarm use aproven concept, the scattered light principle, to "see" smoke within the alarm chamber.
NOW UPGRADED to the 441SRIM with enhanced optical sensor
A regulated pulse of infrared light from a light emitting diode (LED) is introduced into a darkened smoke alarm chamber approximately every ten seconds to form a precise beam. When smoke enters this chamber, it interferes with the beam and scatters the light. The amount of light scattered within the chamber is monitored by a
strategically placed photodiode. When a predetermined level of light strikes the photodiode, the alarm is activated.
The unique smoke chamber design virtually eliminates ambient tight interference in a normal home environment, but still allows easy access for smoke particles from all sides and results in an extremely sensitive and stable smoke alarm.
Alarm Sound Level: 85dB (A) at 3 metres
Operating Voltage: 12-28 Volts DC
Standby Current: 10 mA
Alarm Current: 80 mA
Test Button: Tests sensitivity, circuitry and sounder
Interconnection: Maximum 12 alarms
Temperature Range: 5*C to 39*C
Humidity Range: 10% to 85% Relative Humidity
Dimensions: Diameter 155 mm, Height: 38mm