The Lifetone Bedside Fire Alarm and Clock HLAC151 model uses patented monitoring technology to actively listen for the high-frequency sound of your smoke alarm. Lifetone is not a smoke detector. This product works with smoke alarms that emit a T3 alarm pattern (three beeps followed by a pause). It will not work with alarms that emit a continuous tone pattern with no pauses.
Alerts with sound, talking voice, vibration, and flashing FIRE text on display.
Requires smoke alarms that have a T3 alarm pattern.