Which device is designed specifically to alert individuals through physical vibrations?

The device designed specifically to alert individuals through physical vibrations is the tactile device. Tactile devices are engineered to provide a form of notification that can be felt rather than seen or heard, which makes them particularly beneficial for individuals who are deaf or hard of hearing. These devices enhance accessibility by using vibrations to convey alerts or warnings effectively, allowing individuals to respond to emergencies or important notifications based on physical sensation.

In contrast, sound alarms are intended to notify through auditory signals, making them less accessible to those with hearing impairments. Visual indicators rely on light or visual signals, which may not be perceptible to individuals who are blind or visually impaired. Smoke detectors primarily utilize sound alarms to alert occupants to the presence of smoke or fire, again focusing on auditory rather than tactile notifications. Therefore, the tactile device is uniquely suited for providing alerts through physical vibrations, making it the correct choice.