In case of emergency, warning lights flash to signal an evacuation. Information about notification systems are available from your local hearing society. Build a collection of low-tech devices. The activities of daily living are greatly enhanced by well-designed tools. Office supply stories sell metal book holders for a few dollars each.
Book holders are indispensable for persons with upper-body mobility difficulties.
There are magnifiers that are held in the hand, rest on the desk top, or clamp to the edge of a piece of furniture. Magnifiers are sold at some office supply stores and at stores that specialize in aids for people who are blind or who have low-vision. A Perkins Brailler is a sturdy, seven-keyed typewriter that embosses Braille on paper. Perkins Braillers were popular items in every accessible library I visited. A tape recorder works as a note-taking machine for people who cannot use their hands, are blind, or have certain learning disabilities.