Features: -60 minute visual timer. As time expires, the color disk disappears in clockwise direction -Time management tool for the classroom, office, home, and special needs -No loud ticking; quiet operation! -On/Off optional alert: ideal for sound-sensitive environments -Best for individual or small group use -3 5/8 inches wide by 3 5/8 inches tall (including removable, silicone cover) -Requires one AA battery (not included) -Battery compartment is securely closed by a small screw to adhere to CPSIA standards Dimensions: 6.2D x 10.1W x 10.5H cm