It is different from ordinary PCS in convenient to carry to ensure that health can remind the time again at the same time make sure you can take medicine on time. Set time short beep in order to make your life from now on become the indispensable good health nurse on your side! 1 With a grain of button batteries(Included 1 x CR2450 battery) battery installed can set a time. 2 Set up to take medicine to remind time this is the countdown time at the same time press the "h" and "m" digital flashing press "h" for hour according to the "m" set up according to "st/sp" after confirmation.