The device comes in the form of a flexible patch worn under an infant or child’s arm from where it can continuously monitor a child’s body temperature and send the results via Bluetooth to a parent’s smartphone. Fever Scout has a rechargeable battery and a 100-feet range of operation. The allowing parents to monitor their child’s temperature from up to 100 feet away. The patch will sell for $69, while replacement adhesives will be available for $7.99.