24 hours continuous tempertature monitoring Trace the change of body temperature data at any time High/low temperature alarm App bluetooth connects to app Cloud synchronization for easy viewing Automatically draw the basal body temperature trend chart Replaceable battery design Folding design, lightweight and compact The first high precision double design, accurate to 0.05c, full range of temperature measurement Percision range:0.1c(25c to 45c) Temperature unit: two choice, "c" or "f" Working time: working time more than 180 days(8 hours a day) Button battery: battery specification cr2016, 3v/90mah Principal material: abs+pc main material medical abs+pc