These handy-sized timersfromTickiTcan time up or down to 99 mins and 59 seconds. At which point 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. This TickIt timer can be used in numerous situations where a hands free time period needs to be set or measured. Such as in scientific experiments, games or for the timing of tests.Overall size: 65 x 65 x 13mm.