But how do doorbells for hard of hearing work? Similar to other tools made especially for those with hearing impairment, these doorbells provide a different type of signal to the user. These signals can come either in the form of vibrations, strobe lights, or—for those who can still hear a bit of sound—loud alarms. Choosing the best deaf doorbell system will depend on the type of hearing impairment of the homeowner, as well as their preference and comfort on how they want these signals to be delivered.