The Summer Infant Three-in-One Family Thermometer is the most versatile, accurate, and easy-to-use model on the market, with a super-fast 5-second reading and three probes for easy, hygienic use orally, rectally, or under the arm. Audio and visual alerts take the guesswork out of taking your child's temperature even in the dark, with a beep that indicates a complete reading and a red light that glows when a fever is present. This smart technology includes a 12-memory storage recall and your choice of Fahrenheit or Celsius.