The StoplightGolightTimerhelps everyone manage time. The concept is easily relatable to everyone - even children as young as two. Red light means stop and complete task, Green light means time is up, and it’s time to Go! Simply set the desired amount of time. Press Start, red light illuminates and time counts down. When time is up, red light off, green light on. It’s time to GO!Timer can be set for 0-15 hours and 0-59 minutes.Optional audible alarm included.AC Adaptor included.