Many people do not wake to the sound of a standard smoke alarm. Those
most at risk are the, hearing impaired, those, with high frequency
hearing loss, heavy sleepers and children between the ages of 6 and 16.

Today there is a solution -

The Lifetone HL(tm) Bedside Fire Alarm and Clock, sits by your bed,
listens to your high frequency smoke alarm and responds with a low
frequency 520 Hz Square Wave, 90 dba, alarm coupled with a tactile
bedshaker alarm.

The Lifetone HL Bedside Fire Alarm produces the alarms that are proven
most effective at waking people during a fire.

A 520 Hz Square Wave signal - has been tested in clinical studies and
found to be most effective in waking people at risk.

Lifetone HL(tm) is first UL-listed (217 and 1971) Fire Safety Device
producing 520 Hz square wave alarm and an intermittent tactile alarm
(for the deaf).