The thermometer I bought along with other things as basic equipment for our twins. In the two years previously it worked well. The operation is simple, there is only one button to turn on and off. The end of the measurement is indicated by a significant beep. Whether the measurement results are accurate, I was unable to verify the absence of the second device for a comparative measurement. The handling is good, the flexible tip helps when introduced into baby's bottom. For storage the enclosed envelope is used. The battery was there and also works for two years at admittedly rare use (our twins were not often sick -toi toi toi) yet. Overall, highly recommended.