It is the blue green type of laser pointer

It is the blue green type of laser pointer 
Mentioned here and the text can help you protect your eyes from laser damage CLASS II. The CLASS IIIA of the laser is a continuous wave laser, belonging to medium-energy ((1-5 mW) transmitter. The CLASS IIIA of the use of examples and CLASS II laser is generally the same, such as laser pointer, laser scanners look directly at the CLASS IIIA of the laser is very dangerous, in any case are not directly in the eye CALSS IIIA of the laser at the eyes of any person. Do not use the CLASS IIIA of the laser pointer with a telescope to watch the CLASS IIIA of the laser. These are some must pay attention to problem. The algorithm has strong robustness, security, transparency. Using a special key, it prevents the IBM attack, and the algorithm is also proposed the important principles to enhance the watermark robustness and resistance to attack algorithm, watermark signal should be embedded in the source data, people feel the most important part. To decide which production way is best for the quality and performance of  laser pointer .
This watermark signal by an independent and identically distributed random sequence of real numbers constitute the sequence of real numbers should have the characteristics of the Gaussian distribution N (0,1). Physiological model algorithm. The physiological model includes the human as the HVS (HumanVisualSystem) of HAS and human auditory system. The model not only the multimedia data compression system uses the same for digital watermarking system uses. The basic idea of the visual model are derived from the visual model of the JND (Just Noticeable Difference) description to determine the maximum strength of the digital watermarking can be tolerated in various parts of the image signal so as to avoid undermining the visual quality. In other words, the visual model to determine the modulation mask and image. The document of reference concerning  laser pointer  is very important.The training is to guide the customer to use  laser pointer 
And then use it to insert the watermark. This approach also has good transparency and robustness. The application of digital watermarking field. With the development of digital watermarking technology, digital watermarking applications have also been an extension of the basic applications of digital watermarking is copyright protection, hidden identity, authentication and security are not visible communication. When a digital watermark for copyright protection, the potential application market is e-commerce, online or offline distribution of multimedia content as well as large-scale broadcasting services. Digital watermarking is used to hide the logo can be in medicine, drawing, digital imaging, digital video surveillance, multimedia index and the field of content-based retrieval applications. So the red l laser pointer  is produced by the manufacturer.