The strips will show the current temp through its different color variations after 15 seconds. The measurement range shows the Fahrenheit and Celsius,95 Fto104 F& 35 C to 40 C. Stick or put on the forehead, the strips will indicate your body temperature, won’t affect babies’ sleep. After use, wipe the baby stickers with soap and water and put back into plastic bags to avoid sunlight and heat sources. These temperature thermometer strips are lightweight and small in size for easy storage and carrying, you can easily keep them in your home, office, or while traveling for emergencies