There are two ways that auditory alarms such as bells and sirens can be made accessible to deaf people. One is through the use of flashing lights and the other through the use of a vibrating alarm.
Flashing alarms – which actually benefit everyone in an emergency, especially if the alarm is in a noisy environment like a workshop – are used to make an alarm visual to all in the immediate environment. Tactile or vibrating alarms are only accessible to whomever is wearing the device that vibrates and which interacts with the alarm system. Therefore, it is most common in public places to use flashing alarms.
To explore more fully the options available, you can contact Word of Mouth Technology
This service is based in Melbourne, but provide options for online ordering.