The Dreambaby® Rapid Response Clinical Thermometer has a state of the art fever alert indicator. It gives a quick and accurate reading in 10 seconds and a rapid beep will sound if there is a fever above 37.8°C / 100 °F. Suitable Ages: Newborn to 4 years approx. *NOTE: Not a toy. This product contains 1 x LR44 BUTTON/COIN CELL BATTERIES included WARNING KEEP OUT OF REACH OF CHILDREN Swallowing can lead to chemical burn, perforation of soft tissue, and death. Severe burns can occur within 2 hours of ingestion. Seek medical attention immediately.