Hochiki Photoelectric smoke sensor

Low profile – only 2.00″ high, including base.
Simple and reliable device addressing.
Automatic compensation for sensor contamination.
Built-in fire test feature.
Uses the noise-immune Digital Communication Protocol (DCP), which utilizes interrupts for fast response to fires.
Operating Voltage: 24 – 41 VDC.
Standby Current: 450μA.
Alarm Current: 540μA.
Transmission Method: DCP – Digital Communication Protocol.
Maximum Humidity: 95% RH Non-Condensing.
Air Velocity Range: 0-4000 fpm.
Color & Case Material: Bone – ABS Blend.
Weight: 3.4oz.