Never point the laser at yourself or others' eyes at any time. Even when the laser is turned off, it may accidentally activate. The laser must not be directed at any reflective or smooth surfaces. Lasers have high reflectivity and may reflect off surfaces, potentially causing eye injury if it contacts the eyes. This laser is not a toy and should not be used by children, individuals with limited cognitive abilities, or anyone unfamiliar with laser properties. Misuse can result in serious injury. Wear appropriate laser safety goggles during operation, especially when working with invisible laser beams. Do not direct the laser at vehicles, aircraft, or any manned vehicles. Handle the laser battery with care to avoid short circuits, fire, or explosion. Ensure proper battery installation and prevent unauthorized removal. The unique emission mechanism and generation process of lasers give them distinct properties 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, 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, pre-focused, and securely bonded before shipping. It operates when connected to a 3V DC power supply. Under ideal conditions—clear air with no dust, smoke, or obstructions—the laser beam can travel long distances. With a 20mA operating current, the beam can reach over 1km in high-quality air. 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 educators to highlight areas of interest during presentations. - Electronic level ruler: When mounted on a rotating motor, it projects a straight line onto walls 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 onto a surface. - Long-distance laser monitoring: Direct the laser onto a window of a monitored room, then detect vibrations in the reflected beam to interpret sound. - Remote light-controlled security alarm: Position a laser emitter and photosensor at one corner of a protected area, with reflective mirrors at other corners to create a detection zone. - Long-distance laser wireless communication: Set up paired laser transceivers on rooftops of distant buildings, using microcontroller serial protocols to transmit data or establish internet connectivity.