The Adtemp 429 Non-Contact Thermometer features an infrared sensor that reads temperature from the middle of the forehead with no skin contact required for a safe and comfortable experience that minimizes the risk of cross-contamination. The Adtemp 429 Infrared Thermometer features: Infrared sensor simplifies temperature measurement-ideal for screening Measures in about 1 second without patient contact eliminating the concern of cross contamination or costly probe covers Measurement feedback system signals proper operating distance for accuracy Measures at a distance of 4-6cm (1.5-2.5) from patient's forehead Dual mode - body and object Large backlit LCD display is easy to read Wide Temp Range 30 reading memory Fahrenheit-Celsius switchable Auto-off function after 30 seconds conserves battery life Audible beep when measurement is complete, Night mode mutes volume Compact ergonomic design 5 x 2.06x 1.75 (52.4mm x 44.5mm x 129.9mm), weighs approximately 3oz (87g) with batteries Uses 2 AAA batteries (included) 2 year manufacturer warranty .