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 directed toward people. This laser product is not a toy and should not be used by children, individuals with impaired cognitive abilities, or anyone unfamiliar with laser characteristics. 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's battery with care to prevent short circuits, overheating, combustion, or explosion. Ensure proper battery installation and avoid unauthorized removal. The unique principles of laser emission and generation give lasers distinct properties 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–15mm at 15m This laser head is commonly used in laser tools, leveling devices, alignment instruments, and similar applications. The unit consists of three components: a light-emitting diode core, condenser lens, and copper adjustable sleeve. It arrives fully assembled with the lens focus pre-adjusted and secured with strong adhesive. Simply connect to a 3V DC power supply to operate. Under ideal conditions—clear air with no dust, smoke, or obstructions—the theoretical transmission distance of a laser beam is extremely long. With a 20mA operating current, the beam can travel over 1 kilometer under good atmospheric conditions. On cloudy nights, the spot remains clearly visible on objects up to 200 meters away. At closer ranges, the beam is easily seen on outdoor surfaces such as roads and buildings, even in daylight. Application Examples: - Electronic pointer pen: Teachers can use the laser dot during presentations to direct attention and encourage observation. - Electronic level tool: Mount the laser on a rotating base to project a straight line onto walls for horizontal reference during decoration or hanging items. - Micro LCD projection: Remove the condenser lens and pass the laser through a controllable LCD screen to create a projected image on a wall. - Long-range laser monitoring: Direct the laser onto a window of a room; capture the reflected beam and analyze vibrations to detect sound-induced glass movement. - Remote light-controlled security alarm: Position a laser emitter and photosensor at one corner of an area to protect (e.g., fish pond or field), with mirrors at other corners to create a detection perimeter. - Long-distance laser wireless communication: Install paired laser transceivers on rooftops of two distant buildings, enabling data transmission via serial communication protocols, potentially supporting file transfer or internet connectivity.