Never point the laser at your eyes or the eyes of others. Even when the laser is turned off, it may accidentally turn on. The laser should not be directed at any reflective or smooth surfaces, as reflections can occur and may cause eye injury. This product is not a toy and should not be used by children, individuals with limited understanding, or those unfamiliar with laser properties, as this may lead to injury. Use appropriate protective eyewear when operating the laser, especially with invisible wavelengths. Do not direct the laser beam at vehicles, aircraft, or other occupied vehicles. Handle the laser's battery with care to avoid short circuits, overheating, or explosion, and prevent unauthorized access to the battery compartment. The unique principles of laser emission and generation give lasers 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, Continuous Output Laser Wavelength: 650nm Rated Power: 50mW Voltage: 3V Operating Current: < 20mA Operating Temperature: -36°C to 65°C Storage Temperature: -36°C to 65°C Spot Size: 10mm to 15mm at 15 meters Intended applications include laser leveling tools, alignment devices, and similar equipment. The laser module consists of three components: a light-emitting diode core, a condenser lens, and a copper adjustment sleeve. These parts are pre-assembled before shipment, with the lens focus adjusted and secured using strong adhesive. The device operates by connecting to a 3V DC power supply. Under ideal conditions (no dust, smoke, or obstructions), the theoretical transmission distance of the laser beam is long-range. With a 20mA operating current and high air clarity, the beam can reach over 1 kilometer. At night on cloudy conditions, 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. Possible applications: - Electronic pointer pen: used by educators to highlight areas of interest during presentations. - Electronic level tool: by rotating the laser head, a straight line can be projected onto walls for horizontal alignment during decoration or mounting. - Micro LCD projection: remove the condenser lens and pass the laser through a controllable LCD screen to project images onto a wall. - Long-distance monitoring: project the laser onto a glass surface in a monitored area, then detect vibrations from the reflected beam to analyze sound. - Remote light-controlled security alarm: place a laser emitter and photosensor at one corner of a protected area (e.g., pond or field), with reflectors at other corners to create a detection zone. - Long-distance wireless communication: set up paired laser transceivers on rooftops of distant buildings, enabling data transmission via microcontroller serial protocols.