The Miracle TimeCube Timer, 5 Piece Set, For Time Management, Kitchen Timer, Kids Timer, Workout Timer, Preset Countdown Flip the desired minute side up and the countdown starts, flip to zero side to stop No programming needed - blinking light indicates that the timer is on Excellent Time Management Tool for Home, School and Office Alarm ringer can be set to high or low depending on the activity and preference Each Time Cube requires 2 AAA batteries - not included