Non-contact accurate temperature measuring,Built-in Laser aiming; White backlight liquid crystal display, Auto-data hold and auto-power off 15second after release the testing switch; Pressing the Scan Trigger again will restart the testing process.Please replace a new battery when battery symbol; Displayed on left of LCD. Remind:Do not point the laser directly at the eyes of any people or animal. Operating Instructions: 1. Open cover of battery, install 9V battery, and select the switch of aiming laser and Centigrade/Fahrenheit switch at a proper place as your needs, and then close the cover of battery. 2. Point the aiming sensor at an object (Be sure to consider distance-to-spot ration and field of view), and push the testing switch , and the temperature reading will appear on the display. When the testing switch is released, the LCD will auto-store the last temperature reading and turn off in about 15 seconds. 3. Pressing the Scan Trigger again will restart the testing process. 4. Please replace a new battery when battery symbol displayed on left of LCD.