The Dreambaby Rapid Response Digital Thermometer is a fantastic product which should be an essential in every home. It comes equipped with a state of the art fever alert light-up indicator which will indicate the temperature in under 8 seconds. The display will instantly turn red if a fever – temperature above 98.6 degrees – is indicated and green if temperature is within normal range. This product is of course useful not only for children, but adults too, and is made from durable material which will last for years. Details:Temperature range 32.0 - 42.9 C (90.0 - 109.4 F)Celsius and FahrenheitContains no mercuryLong battery life