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A variety of impairments may affect an employee’s ability to concentrate. Decreased concentration can be caused by auditory distractions (that can be heard) and/or visual distractions (that can be seen).


Alerting devices can be used to notify a person who is deaf or hard of hearing to sounds in the environment. An individual can be alerted to sounds like a telephone ringing, a doorbell or an emergency alarm through vibration or a light signal. A transmitter detects certain sounds and then sends a signal to a receiver that vibrates or blinks a light.