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 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 using invisible lasers. Do not direct the laser beam at vehicles, aircraft, or any manned vehicles. Handle the laser battery with care to avoid short circuits, fire, or explosion. 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 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: 15m at 10mm–15mm This laser head is commonly used in laser tools, leveling devices, and alignment instruments. The unit consists of three components: a light-emitting tube core, condenser lens, and copper adjustable sleeve. It is pre-assembled and focused before shipping, with the lens secured using strong adhesive. The device operates when connected to a 3V DC power source. Under ideal conditions (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 air quality. 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 pointer pen: Used by teachers to highlight points during presentations. - Electronic level ruler: Mounted on a rotating base to project a straight line for alignment in construction or decoration. - Micro LCD projection: Remove the condenser and pass the laser through a controllable LCD screen to project images. - Long-distance laser monitoring: Direct the laser at a glass surface in a monitored room, detect vibrations in the reflected beam, and recover o signals. - Remote light-controlled anti-theft alarm: Set up a laser emitter and photosensor at one corner of an area, with reflectors at other corners to create a detection field. - Long-distance laser wireless communication: Install paired laser transceivers on rooftops of distant buildings to transmit data using serial communication protocols.