The green 200mW laser pointer is very cheap. It's easy to unpack. Note that the lamp itself can only rotate up and down. It's not my problem. It became brighter than I expected. I now have to order for more than a month. Make sure it works, but set it exactly as I want it to. I want to turn on the green laser pointer with any lighting, but I don't recommend connecting it. I'm looking for something to light up the path and backyard from the balcony. The laser classification system was created in the early 1970s, revised in 2007, and then approved by the FDA. The system is an important part of laser safety, can display the laser danger level, and sell and own USB Laser Pointer. The ratings range from low (level 1) to severe (level 4), depending on how much damage the laser can cause to humans. The likelihood of laser damage is measured primarily by milliwatt output related to wavelength and exposure time.
Medium power laser. Looking directly at a beam can cause light damage. It can be further divided into IIIA and IIIB. Class IIIA lasers have an output range of 1 to 5 mW and beam energy densities of 25 W/Mm or less. Typical applications are similar to Class II, such as laser sites and laser scanners. Laser systems, especially high-power systems, require a large amount of voltage, and power-related problems can lead to erratic output power and catastrophic damage. No stable power supply, no stable laser output. Class 4 Lasers Class 4 lasers are the most powerful lasers and are most likely to cause serious injury to the human body. Unlike other laser classes, which are considered dangerous only when directly observed, Class 4 lasers can cause serious damage even when indirectly observed. Contact can burn the skin and pose a fire hazard. Laser safety is of the utmost importance when dealing with class 4 lasers.