First, please do not aim or shine a laser pointer at anyone. Green laser pointer are dangerous, especially for outdoor use with high-power lasers and lithium battery laser flashlights. The focus of the laser has a certain amount of heat, which can cause physical damage. Second, the laser beam has a dazzling effect at close range. Do not look at the beam closely for a long time, and do not look at the beam deliberately. The scattered light from the laser beam can strain your eyes. The laser pointer is activated only when it is pointed at a nearby object.
Third, make sure the laser is not aimed at others or yourself when used, and be careful not to aim at substances that ignite easily when used at close quarters. Don't buy laser Pointers for your kids. Lasers are not toys. Fourth, if you are too nervous, or if you are not in good physical condition, your hand will shake, then do not point the high power laser pointer at the screen, it will reveal your bad state. Before purchasing a laser pointer, make sure its label, it complies with Chapter 21 CFR(Federal Regulation), displays the name and date of the manufacturer or distributor of the product, and warns the name of the class to avoid exposure to laser radiation, from Class 1 to Class IIIA. Fourth, Category IIIb and IV products should only be used by properly trained individuals and should be used in applications where there is a legal requirement for these high-power products.It is important to choose the right laser pointer for you. A good laser pointer has the following characteristics:Small enough to fit their hands; The distance between the keys is appropriate, it is not easy to press the wrong key because the distance is too close; Operation must be simple, a key can only have one function, otherwise easy to make mistakes; Preferably suitable for ordinary batteries; Durable, reliable quality; Finally, it's best to have personalized features such as timing, timing vibration, mouse function and even USB flash drive, but remember that these are secondary and don't interfere with the use of the main features.