How to buy a real green laser pointer?

In recent years, with the development of the times, laser pointers have become more and more popular among teachers and professional speakers. Laser pointers have freed them from the restriction that they can only stand on the podium. They only need to hold the laser pointer to operate PowerPoint. Page up and down pages of various versions of Office software such as Office XP, Office 2003, Office 2010, and software such as picture viewers, web browsers, and e-book software. Press the laser pointer to indicate the key points and turn pages up and down, or use the laser pointer as a mouse. The laser pointer with mouse function only needs to check the receiver on the computer to realize the function of the left and right mouse buttons and double click. You can also open hyperlinks, one-click annotations, support black screens, etc., so the laser pointer completely relieves the demonstrator’s worries of “need to operate the computer while explaining”, and truly realizes “where you go, where you go, where you talk, where you talk, and point to "Which", to solve the inconvenience of using the mouse in the past, in fact, choosing a laser pointer mainly depends on the cost performance of the laser pointer. The following are several factors of the cost performance of the laser pointer: