Set it and go. You and your students will reach for this super simple timer to support a variety of classroom activities. * Offers unique visual and auditory indicators, including a warning alarm * Operates easily with just 2 dials: total alarm time and warning time * Provides flexibility with total alarm time range of 5 minutes to 2 hours, in 5-minute increments * Counts down until the colored light glows and the alarm sounds * Supports visual-only timing when you adjust volume or turn off the sound completely * Measures 3.25"L x 3.25"W x 4.75"H * Requires 3 AAA batteries, not included