Ionisation alarms detect the presence of large quantities of very small particles entering the ionisation chamber, when in sufficient quantity will cause an alarm to sound. Sufficient quantities of particles are generally only produced by flaming fires or from very hot surfaces. Ionisation alarms are more responsive to fires that start as, or quickly escalate into a flaming stage.

- Ionisation Sensor - sense visible or invisible particles of smoke at the earliest stage
- Easy installation (wall mount bracket & screws included)
- Extra loud alarm (sound over 85dB)
- Built-in test button (functional testing)
- Low battery warning
- 9V batteries included