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The JA-150ST optical BUS smoke and temperature detector detects fi re inside residential or commercial premises. It allows these settings: smoke and heat, smoke or heat, smoke only, heat only. It has an alarm memory function where the LED still lights after the alarm state is over. It is battery powered by alkaline batteries. It is addressable and occupies one position in the alarm.

Specifications
- Power: 3x alkaline batteries AA 1.5 V
- Typical lifetime: 2 years
- Communication protocol: 868 MHz
- Fire detection: optical and heat
- Fire detection sensitivity: m=0.11/0.13 dB/m by EN 54-7
- Temperature detection: class A2 EN-54-5
- Alarm temperature: 60 to 70 °C
- Dimensions: diameter 126 mm, height 50 mm
- Operating temperature range: -10 to 80 °C