Green, then yellow, then red - a warning before time runs out Dome timer, 7.5 x 7.5 x 12.5cm. Two dials: total time from 5 minutes to 2 hours, and a separate warning time. The dome lights green, then yellow, then red. Volume control, or silent. 3 AAA batteries, not included. Ages 3+. $62.40. The second dial is what makes this different from