Once you figure out the on/off switch, as it is in chinese, they are easy to use. We use them in our veterinary hospital as reminders to get readings on patients and give medications on a timely basis. We have had them for a year, at least, and they are still going strong. Takes a standard battery (I forget if it is AA or AAA, but one of the two), and they are loud enough for technicians to hear, but not so loud it startles our patients.
Rating:
[5 of 5 Stars!]