This mechanical Tactile Low Vision Timer with oversized White Dial features raised, large, bold, black, tactile numbers. This 60-minute mechanical timer is great for indoor and outdoor use. Ideal for the visually impaired and those with arthritis. NOTE: To activate the mechanical spring timer, first turn dial to 55 minute mark before dialing to your desired time. Timer measures 8 inches diameter. Numbers measures a tall 1.125 inches high.