These handy sized Dual Power Timers can time up or down to 99 mins and 59 seconds. A bleeping alarm is sounded to say the time has been reached. Having dual power functionality means they are always charged and ready to go. The push buttons have been designed for ease of use. The timers can be used in numerous situations where a hands-free time period needs to be set or measured such as in scientific experiments, for circle time, games, the timing of tests and so much more.