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.