how does infrared thermometer works

Product Features:

• Sleek, Compact, Rugged design.
• Anyone can tightly hold this device like a gun.
• Colorful (three-color) clearly shows the low, high, or mid temperature.
• Multiple modes are available to take the temperature to see in Celcius or Fahrenheit.
• Needs only two batteries AAA alkaline or lithium-ion cylindrical to operate.
• Show temperature just within a second after pushing on the trigger.
• 1-year manufacturing warranty by the brand.