FireProtect Black, Smoke/Temperature Sensor, AJAX

Sensor Type: Wireless
Temperature Detection: From +54°C (+129°F) to 65°C (+149°F)
Tamper Protection: Yes
Alarm Type: Light and sound signals
Siren Volume: 85 dB
Transmission Signal Power: 20 mW
Transmission Protocol: Jeweller (868.0-868.6 MHz)
Maximum Transmission Range: Up to 1,300 meters
Power Supply: 2 CR2 batteries
Power Voltage: 3 V
Battery Life: Up to 4 years
Operating Temperature: From 0°C (32°F) to +65°C (+149°F)
Dimensions: 132x132x31 mm
Weight: 220 g