Optical smoke detector with temperature sensor, Schrack Cyrus, with 2x1.5V batteries, wireless 433MHz

The device is a photoelectric smoke detector which can easily detect smoldering fires (causing less heat but much smoke). Additionaly there is a heat sensor installed for fires that are causing big heat but only a less amount of smoke (alerting between 54 and 70°C). Up to 30 wireless smoke detectors can work in a network furthermore it is possible to mute the device for approximately 10 minutes while it is alerting. This is very useful for false alarms caused e.g. by steam. 

Specifications:

Power supply: 2 x 1.5 V AA battery

Alarm volume: >85dB (in 3m distance)

Working tempreture: 0 - 50oC

Wireless range: 100m outside; 20m inside

Radio protocol: RF 433MHz

Dimensions: 15.4 x 11.7 x 5cm

Weight: 0.226kg