Never point the laser at yourself or others' eyes at any time. Even if the laser is turned off, it may accidentally turn on. 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 it contacts 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. Misuse may result in injury. Wear appropriate laser safety goggles when operating the device, especially when working with invisible lasers. Do not aim 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 principles of laser emission and generation give lasers distinct characteristics not found in ordinary light: excellent monochromaticity, coherence, directionality, and high 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 tools, leveling devices, and alignment 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—no dust, smoke, or obstructions—the theoretical transmission distance of a laser is extremely long. With 20mA operating current and high air quality, the beam can travel over 1km. The spot is clearly visible on objects 200 meters away on cloudy nights. At closer ranges, the beam remains clearly visible on outdoor surfaces such as roads and buildings even in daylight. Applications include: - Electronic pointing device: Used by educators to highlight areas of interest during presentations. - Electronic level tool: When mounted on a rotating motor, it projects a straight line for horizontal reference in decoration or alignment tasks. - Micro LCD projection: Remove the condenser lens and pass the laser through a controllable LCD screen to project images onto a wall. - Long-range laser monitoring: Direct the laser onto a window of a room; the reflected beam can be analyzed to detect glass vibrations and recover sound. - Remote light-controlled security alarm: Position a laser emitter and photosensitive resistor at one corner of an area to be protected (e.g., a pond or field), with reflective mirrors at the other corners to create a detection perimeter. - Long-distance wireless communication: Install paired laser transceivers on rooftops of distant buildings, using microcontroller serial protocols to transmit data or establish internet connectivity.