Low Frequency Fire Alarm for the Hard of Hearing
Call Us Toll-Free: 1-800-648-7923

The New HLAC151





Lifetone HLAC151
Lifetone HLAC151
The Lifetone HLAC151 uses patented monitoring technology—perfected over 10 years of development—to actively listen for the high-frequency sound of your smoke alarm. When it detects a smoke alarm, your HLAC151 wakes you up and alerts you with 4 different signals: a loud, low-pitched (520 Hz) T3; a powerful vibrating bed shaker; instruction in a baritone voice (“Fire! Get out!”); and FIRE in large text against a flashing orange backlight. Free priority shipping to US addresses. Sleep safely.
Price: $214.95

For Canadian purchase click here

For additional information, please call us at (800) 648-7923
Outside the US and Canada, please call   1-405-200-1698
Or e-mail support@lifetonesafety.com.
Sleep safely.

Features and Specifications

  • Uses the alarms proven in research sponsored by the US Fire Administration as most effective for waking people
  • Works with your existing working smoke alarms – no installation, no wiring required (note: the Lifetone HLAC is not a replacement for your current smoke alarm, but rather works in conjunction with it)
  • Needs nothing but a power outlet; plug it in, run it through a quick test to prove it detects your your smoke alarms, and it’s instantly on duty
  • Backup batteries last 7 days or more while still providing full-power emergency alarm signals. Uses common D-cell alkaline batteries for backup (included).
  • Big, easy-to-read time display with three brightness levels. It also alerts you if batteries are low or the bed shaker is disconnected, and a power icon flashes during power outages.
  • Powerful water resistant bed shaker is included, but its use is optional. The shaker is monitored (supervised), with audio and visual alerts if unintentionally disconnected or damaged.
  • The HLAC is also your daily alarm clock with a 520Hz audible alarm and bed shaker to awaken you in the morning. (The wake-up alarm has a different signal pattern than the emergency alarm.)
  • Dimensions: 8 1/2″ L x 5″ W x 4″ H
  • The only 520 Hz Fire Safety Alarm and Bed Shaker listed by UL to UL 217, cUL S531, and UL 1971, and listed by UL as a low frequency sounder. The HLAC is NFPA 72 (2010-2013) Compliant. For use with residential smoke alarms or commercial notification appliances in the US and Canada.
  • Comes with a 2 Year Warranty and friendly customer service and technical support (800 648­-7923)

Sleep safely with the HLAC Bedside Alarm! Click here for Detailed Specifications or here for Frequently Asked Questions.


The Lifetone HL™ Bedside Fire Alarm and Clock



There is a conventional high-pitched smoke alarm at the beginning of this video.
Can you hear it?   Would it wake you up?

*Turn your system volume up for this, but be aware that small speakers in laptops and tablets may render the audible Lifetone alarm at a slightly higher pitch than 520Hz, and the sound level will not be as loud as the HLAC actually is (85 dB at 3 ft. is really loud). If you don’t hear the conventional alarm, please think about it.

HLAC151 Overview

The Lifetone HL uses patented monitoring technology – perfected over 10 years of development – to actively listen for the sound of your smoke alarm (and ignore all other sounds at the same frequency, about 3200 Hz). When it hears your smoke alarm it immediately initiates four alarm signals to wake you up now:
  • 520 Hz square-wave alarm: This special sound has been proven in controlled scientific testing to be the most effective at waking people up in a fire emergency. The Lifetone HL is over 85 to 90 dB if it’s 3 feet away on your nightstand – that’s like having someone start a lawn mower next to your bed.
  • Baritone voice alarm: A loud baritone voice shouts “FIRE! GET OUT! to tell you exactly why you have been awakened and what to do. The baritone can be heard and the words easily understood by those with high frequency hearing loss.
  • A physical vibration from the bed shaker: A powerful clam shell-like device about the size of the palm of your hand plugs in to the back of the unit. When the alarm is triggered, the bed shaker, usually placed between the top mattress and mattress pad, vibrates strongly. The bed shaker is included but its use is optional.
  • A visual signal: The bright back-lit bright orange display flashes with the word FIRE. In a darkened room, the flashing display is another form of sensory stimulation to “break through” the fogginess of sleep and tell you what the emergency is.