iFertracker makes tracking your fertility simpler and more accurate than ever before by monitoring your core body temperature while you sleep. The iFertracker app and device take the age-old, scientifically-proven method of Basal Body Temperature tracking into the 21st century. With wireless syncing and notifications for each upcoming phase of your menstrual cycle, you won't waste another minute trying to figure out when you're most fertile. * Take the stress out of finding your fertile window and ovulation day, you only have to wear iFertracker while you sleep  * Map out each phase of your cycle and be aware of what's approaching - we all want to know when Aunt Flow is on her way! * No more worrying about waking up at the right times or not moving a muscle in the mornings so you can get an accurate BBT reading * Learn more about your body and regain flexibility in timing intercourse with your significant other What comes in the box? 1 iFertracker wireless sensor, 30 patches, 1 CR2025 battery, 1 battery tool, 1 user manual