Reminder on how to use the medicine box: 1. Install a button battery. If the lid is not easy to cover, you can use a coin lid to make it easier to cover it. Set the medication reminder time. This is the countdown time. When pressing the "h" and "m" numbers simultaneously to flash, press "h" to set the hour, press "m" for the hour, and then press "st/sp" to confirm after setting. Capacity 1L