Visual doorbell signaling devices, vibrating alarm clocks, smoke and fire detectors with visual alarms, personal pagers, siren detectors, computer modems, answering machines, fax machines, electronic mail and bulletin boards, loud-ring signals, loud buzzers and strobe lights.
The purpose is to get the deaf persons attention and alert as quick as possible.
Most alerts are either with bright lights or vibrations.
1st EditionGlen Krutz
1st EditionCarl A. Woloszyk, Grady Kimbrell, Lois Schneider Farese
1st EditionDavid Besanko, Mark Shanley, Scott Schaefer
10th EditionElliot Aronson, Robin M. Akert, Samuel R. Sommers, Timothy D. Wilson