Home security fire alert smoke sensor wired detector easy DIY home security with various types smoke detector and CO sensor for selection.
DC5V 4 wires smoke detector with relay output
Product Description:

This product named photoelectric smoke detector detects the smoke by a couple of diodes.The principle of detecting is granule in the smoke can reflect light. diodes are placed in the special chamber. The chamber can shield external light,but doesn't affect the smoke into it. while there is no smoke, the diode can receive very weak light. When the smoke entering the chamber,diode can receive more and more light,and the detector can give out alarm signal when the smoke accumulates to the certain density. In order to reduce the interference and lower power consumption, the emitting circuit adopts the pules signal. The product in accordance with the networking approach is divided into 2 -wire and 4-wire detectors.
Available on line at https://vedardalarm.com/smoke-detector-relay-output-4-wire-5v-power-p-300
Technical Specification

Operating Voltage: DC5V

Standby current: 2mA(24V NO/13MA 24VNC)

Alarm current: 18mA (24Vno) 6mA(24v nc)

Alarm Indication: RED LED ON

Alarm Output: RELAY OUTPUT

CONTACT RATING ：1A @DC5V/DC48V

Sensitivity: 0.5db/m (+-0.1db/m)

Demension: 103mm*53mm