Wavelength: 650NM power: 5MW outer diameter: 6MM1: pay attention to the safety of laser battery to prevent others from disassembling the power pool and causing short-circuit combustion or battery explosion accident.2: the principle of laser emission and the particularity of the production process determine that the laser has the characteristics that the ordinary light does not have: namely three good (monochromatic good, good coherence, good direction) a high (high brightness).3: mainly used for laser toys, all kinds of level, ground line, etcMake electronic pointer pen: when the teacher is lecturing, use the laser projection point to ask the students to observe and think.Electronic level: let the motor drive the bald head to rotate or twist, projected into a straight line on the wall, for decoration or paste New Year pictures do horizontal reference.Miniature LCD projection: remove the concentrator, let the laser through the controllable LCD screen, can produce a clear projection on the wall.Remote laser listener: the laser is irradiated on the glass of the room being overheard, and then receives the laser beam reflected back from the glass, detecting the vibration of the glass and restoring the room floor sound.Remote light-controlled burglar alarm: install a laser tube and a photosensitive resistor on one corner of a protected fish pond or watermelon field, and a reverse mirror on the other three corners to form a protective zone.Remote laser wireless communication: the use of a pair of laser transceiver devices in the two distant roof opposite each other, the use of a single chip microcomputer serial communication protocol can send and receive files, and even network.The laser head consists of three parts: the luminescent tube core, the focusing lens and the copper adjustable sleeve. When it is sent to the user, the three parts have been assembled, the focal length of the lens has been adjusted, and it has been glued with super glueOk, the user can work with 3V dc power supply.