Never point the laser at yourself or others' eyes at any time. Even if the laser is turned off, it may be accidentally activated. The laser must not be directed at any reflective or smooth surfaces. Lasers have high reflectivity and can reflect off such surfaces, potentially causing eye injury if they contact the eyes. This product is not a toy and should not be used by children, individuals with limited understanding, or those unfamiliar with laser properties. Misuse may result in injury. Wear appropriate protective eyewear when operating the laser, especially when using invisible wavelengths. Do not direct the laser beam toward vehicles, aircraft, or any manned vehicles. Handle the laser's battery with care to avoid short circuits, overheating, combustion, or explosion. Ensure proper installation and prevent unauthorized removal. The unique principles of laser emission and generation give lasers distinct characteristics not found in ordinary light: high monochromaticity, coherence, directionality, and brightness. Product Name: Laser Small Copper Head (Red Light) Output Power: 5mW Lifespan: Over 1000 hours Beam Mode: Dot spot, continuous output Laser Wavelength: 650nm Power: 50mW Voltage: 3V Current: < 20mA Operating Temperature: -36°C to 65°C Storage Temperature: -36°C to 65°C Spot Size: 10mm to 15mm at 15m distance This laser head is commonly used in laser devices, leveling tools, and alignment instruments. It consists of three components: a light-emitting tube core, condenser lens, and copper adjustable sleeve. The unit is pre-assembled before shipping, with the lens focus adjusted and secured with strong adhesive. It operates when connected to a 3V DC power supply. Under ideal conditions (no dust, smoke, or obstructions), laser beams can travel long distances. With 20mA operating current and clear atmospheric conditions, the beam can reach over 1km. The spot remains clearly visible on objects up to 200 meters away on cloudy nights. At closer ranges, visibility remains strong even under daylight conditions on outdoor surfaces. Applications include: - Electronic pointer pen: Used by educators to highlight areas of interest during presentations. - Electronic level ruler: When mounted on a rotating motor, it projects a straight line for alignment during construction or decoration. - Micro LCD projection: Remove the condenser lens and pass the laser through a controllable LCD screen to project images. - Long-distance monitoring: Direct the laser onto a glass surface; reflected vibrations can be analyzed to detect sound activity. - Remote light-controlled security alarm: Position a laser emitter and photosensor at one corner of an area to protect, with mirrors at other corners to create a detection field. - Long-distance wireless communication: Use paired laser transceivers mounted on separate buildings to transmit data via serial communication protocols.