At the top is a digital clock that's powered by a replaceable watch battery. Choose to set a countdown timer with alarm that alerts readers when they have completed their required reading time or use the cumulative timer, which stores up to 100 hours of reading time over multiple sessions until the reader chooses to delete it. A 60-second countdown/count up feature displays seconds at the one-minute mark to aid in fluency checks. Also ideal for timing music practice sessions, timed math fact activities, meetings, homework study sessions, cooking and interval training when exercising. Parents and teachers from across the country confirm that the mark-my-time digital bookmark is the best and easiest way to monitor reading time and keep kids excited about reading so they'll want to read more.