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 should not be directed at any reflective or smooth surfaces, as reflections can occur and potentially cause eye injury if they contact the eyes. This laser is not a toy and should not be used by children, individuals with limited understanding, or those unfamiliar with laser properties, as this increases the risk of injury. Wear appropriate protective eyewear when operating the laser, especially when using invisible laser beams. 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, particularly during removal or replacement. 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 Spot 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 This laser head is commonly used in laser devices such as levels, alignment tools, and measuring instruments. It consists of three components: a light-emitting tube core, condenser lens, and copper adjustable sleeve. The unit is pre-assembled, with the lens focus adjusted and secured with strong adhesive before shipment. It operates by connecting to a 3V DC power supply. Under ideal conditions—free of dust, smoke, and obstructions—the theoretical transmission distance of a laser beam is extremely long. With a working current of 20mA and high air quality, the beam can travel over 1km. On cloudy nights, the spot is clearly visible on objects up to 200 meters away. At closer ranges, the beam remains clearly visible on outdoor surfaces such as roads and buildings even in daylight. Applications include: - Electronic pointer pen: used by teachers during presentations to highlight points of interest. - Electronic level ruler: when mounted on a rotating motor, it projects a straight line onto walls for alignment during decoration or mounting objects. - Micro LCD projection: by removing the condenser lens, the laser can pass through a controllable LCD screen to project images onto a wall. - Long-distance laser monitoring: the laser beam is directed at a glass surface in a monitored area; reflected light is captured and analyzed for vibrations to detect sound. - Remote light-controlled anti-theft alarm: a laser emitter and photosensitive resistor are placed at one corner of an area such as a pond or field, with reflective mirrors at other corners to create a detection zone. - Long-distance laser wireless communication: a pair of laser transceivers are aligned between two distant buildings, enabling data transmission using serial communication protocols.