The smooth and flat probe on the MMC-W501 thermometer increase the contact area with skin, so the measurement is more accurate and there is less pressure on the skin. There is also a buzzer on the back of the thermometer to remind users to switch it off or that the measurement is finished. The built-in backlit screen and the high-ratio digital display make it easy to use in the dark. The Bluetooth module works with a mobile app, allowing you to continuously collect temperature data and predict your fertile periods in the menstrual cycle.