PowerAid Info


The 520Hz signal used in the 'PowerAid' app is designed to conform to alarm systems for hearing impaired.

Excerpt from the research papers on the 520 Hz alarm signal:

A 520 Hz square-wave T-3 sound was the single most effective signal, awakening 92 % of participants with hearing loss, depending on the volume of the signal.

The 3100 Hz pure tone T-3 sound, which is the tone in most standard smoke alarms, awoke only 44 % of participants with hearing loss.

The low-pitch T -3 sound awoke children (aged 6 to 10) 96 % of the time. The high pitch standard alarm awoke children only 57 % of the time.

If you have very high needs, you might consider a professional hardware power failure alarm, like these from Amazon:

Product Features

  • Rated 4.5 stars on Amazon
  • Outlet saving 15 amp with piggyback Plug, 110 / 120 Volt,
  • Toggle on/off switch, Test button, Mount up to 6 foot from outlet,


Product Features

  • Rated 4.5 stars on Amazon
  • Loud: 103dB can be heard even in noisy factories.
  • 10-year battery which alarms for 48 hours.


Product Features

  • Rated 4.5 stars on Amazon
  • Automatic phone-out home monitoring system
  • Base unit calls up to three telephone number
  • Keypad base unit plugs into phone line and electrical outlet
  • Will continue calling for up to 10 hours if needed
  • Battery included, UL Listed