Batteries are included, but may be running low.
Easy Home Thermometer
Ovulation Tracker Digital Basal Thermometer: Easy@Home BBT Thermometer for Fertility Tracking - Basal Body Thermometer for Accurate Temperature Monitoring with Premom App Purple DMT-3018
Ovulation Tracker Digital Basal Thermometer: Easy@Home BBT Thermometer for Fertility Tracking - Basal Body Thermometer for Accurate Temperature Monitoring with Premom App Pink DMT-3018
