A. Press the on-off button to turn on the thermometer, the window will display 188.8M and a deep sound will be heard. This indicates that the unit is in working condition. B. Upon releasing the on-off button, last measured temperature will be showed for about two seconds with letter "M" under the degree sign, then 37ºC/98.6ºF, and then LoºC displayed(if the room temperature is greater thab 32.0ºC/89.6ºF,it will be displaye rather than LoºC).Th flash ºC indicated the thermometer is ready to take a temperature. C. Take temperature by ORAL, UNDERARM(AXILLARY), or RECTAL method.