Standard fire alarms and smoke detectors may not wake up people with hearing loss. The first of its kind; the Lifetone HL™ Bedside Fire Alarm and Clock uses a 520 Hz square-wave sound pattern proven by the Fire Protection Research Foundation to be more effective at alerting and awakening people with hearing loss, seniors, children, and heavy sleepers than standard fire alarms. The Lifetone HL is both a state of the art fire alarm and an attractive and easy to use alarm clock. The patented Lifetone HL™ sensor listens for your existing smoke detectors (smoke alarms) and then broadcasts its low frequency, 520Hz square wave sound pattern. Be protected. The Lifetone HL™ helps ensure a life-saving environment for you and the ones you love.
This next part is extremely important to note. The upcoming 2010 edition of NFPA 72® National Fire Alarm Code has made significant changes to the code especially concerning people who have mild to severe hearing loss. It has been shown that a low-frequency (520 Hz) square wave fire alarm effectively awaken and alerts people who have mild to moderately-severe hearing loss and should be installed in sleeping and guest rooms. If you have a profound loss, this new code requires the use of tactile or vibration in addition to high-intensity strobes in sleeping and guest rooms.
Now, I am one of those in the profound category which means without my cochlear implants, I can put a standard 3100 Hz pure tone sound of current smoke detector to either one of my ears and I can't hear it. Then again, a F-16 fighter jet can take off in my driveway and I wouldn't hear that either. So this is a very real concern for people in my position. When I did the demo of the Lifetone Fire Alarm, I could not hear obviously the low-frequency (520 Hz) square wave but people with a milder/moderate loss were able to hear it without hearing aids or cochlear implants. Thus people in my profound position, must rely on the high-intensity strobes and bed shaker as the new National Fire Alarm Code suggests. Lifetone lacks the strobes for me and it would be perfect if they did.