In this guide you will find a detailed description and diagram of the communication device between two computers on the laser pointer. The device is simple it can collect any who knows how to handle a soldering iron. All design details are available and affordable. The apparatus operates stably at 115200 at ~ 300 meters, when modifications can be achieved and a greater distance. The receiver is extremely resistant to various kinds of illumination. Conventional illumination lamp 60 watts from a distance of 70 cm at an angle of 30 degrees does not affect the operation of the circuit. The archive with the guidance as gifts is another guide "radio COM-port.". So you buy 2 guidelines for the price of one.