For all pill-taking schedules. Unlimited number of pill bottles can be connected to the unit. Choice of AC adaptor and 2 AA batteries. Batteries also used as power failure backup when using AC adaptor. Useful for other events as well. This neat handy device can alert you the scheduled times for your medications by pressing just 2 buttons. Simple and convenient. Perfect for people taking multiple medications/dietary supplements more than once a day. Pill-Mate stands out from other medication reminders. Can set reminders for unlimited bottles of medications. Fit for all common medication schedules including 1-4 times a day and weekly. Ultra simple to use - press only two buttons and you"re set to go. No complicated programming necessary. Easy to understand schedule-buttons listed by pill-taking frequency. Durable for years of usage. Power: 3V batteries or AC adaptor (sold separately), output 3V. Current: about 15mA. One year warranty.