Professional technology ensures accuracy every time. Fast, gentle and easy to use. Recommended for infants, children and adults. Why measure in the ear? The ear canal is the best site to measure a fever because of its close proximity to the eardrum, which shares the blood supply of the brain's temperature control center. This site allows for a more accurate reflection of the body's core temperature. Exclusive pre-warmed tip technology is designed to minimize the cooling effect of the tip inside the ear canal, providing accurate measurements time after time. Unique positioning system uses a light and beep to confirm proper positioning. Memory function recalls the last temperature reading. Always replace disposable lens filters to maintain accuracy and hygiene. Replacement lens filters. Contents: Braun ThermoScan Ear Thermometer; Protective Case With Lens Filter Storage; 21 Disposable Lens Filters; 2 AA Alkaline Batteries