The USB is also a part of laser pointer

The USB is also a part of laser pointer . 
Laser as a weapon, there are many unique advantages. First, it can fly with the speed of light, 300,000 km per second, no weapons, no such high speed. Once it is aimed at, what time do almost immediately hit the target, need to consider the amount in advance. In addition, it can be in a very small area, in a very short time, 100 times more concentrated than nuclear energy, but also the flexibility to change direction, there is no emission of pollution. Laser weapons are divided into three categories: First, blinding type. Earlier we talked about airborne blinding weapons fall into this category. Second, close tactical, used to shoot down missiles and aircraft. The United States in 1978 with TOW anti-tank missile laser experiment is to use such weapons. Third, long-range strategic type. The greatest difficulties of such research, but if successful, the greatest effect, it can be anti-satellite, anti-intercontinental ballistic missiles, the most advanced defensive weapons.
Therefore, the working status of digital circuit is "0" is located at near. Direct modulation bandwidth: because the junction capacitance characteristics of semiconductor lasers, and can not be drawn like the diagram above as the ideal work for different input laser frequency, the response is not the same, generally the higher the frequency, the amplitude of the output optical system, the smaller the stress . Semiconductor laser bandwidth is defined as the amplitude of the input signal under the same conditions, the output light intensity is low-frequency modulation amplitude modulation 1 / 2 frequency. The 2.4G technology of laser pointer is the selling point of laser pointer .
The 2.4G technology of laser pointer is at the world’s level. Laser product hazard level classification is to describe the laser system to the extent of human damage to the definition of indicators. Classification from Class I laser (no damage) to Class IV lasers such as the 2000-watt carbon dioxide laser (you can cut thick steel plate). Manufacturers must be Class II, Class III and Class IV laser products are labeled with the risk level classification of the words with laser warning label. The beams are likely to view any blocked, and exposed to the laser in the laser system is interlocked. This kind of laser pointer has the directivity.
Output power of 1 mW. Will not burn the skin, does not cause a fire. As the eye reflex can prevent some eye damage, so these are not considered dangerous laser optical devices. In this type of laser equipment should be placed on a yellow warning label. Output power of 1 mW to 5 mW. Will not burn the skin. Under certain conditions, these lasers can cause blindness and other eye damage.