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 can reflect off such surfaces, potentially causing eye injury if they contact 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 characteristics. Misuse can result in serious injury. Wear appropriate protective eyewear when operating the laser, especially when using invisible wavelengths. Do not aim the laser at vehicles, aircraft, or any manned vehicle. Handle the laser's battery with care to prevent short circuits, fire, or explosion. Ensure the battery compartment is secure and protected from tampering. The unique emission mechanism and generation process of lasers give them properties not found in ordinary light: high monochromaticity, high coherence, high 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 devices, leveling tools, alignment instruments, and similar applications. It consists of three components: a light-emitting diode core, condenser lens, and copper adjustable sleeve. The unit is pre-assembled before shipping, with the lens focus adjusted and secured with strong adhesive. Simply connect to a 3V DC power supply to operate. Under ideal conditions (no dust, smoke, or obstructions), laser beams can travel indefinitely. In clear air with a 20mA operating current, the beam can reach over 1 kilometer. On cloudy nights, the spot remains 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 under daylight. Applications include: - Electronic pointing device: Teachers can use the laser dot during presentations to direct attention. - Electronic level tool: Mount the laser on a rotating base to project a straight line for alignment during construction or decoration. - Micro LCD projection: Remove the condenser lens and pass the laser through a controllable LCD screen to create wall projections. - Long-range monitoring: Project the laser onto a glass surface in a surveillance setup; reflected vibrations can be analyzed to detect sound. - Remote light-controlled security alarm: Position a laser emitter and photosensor at one corner of an area like a pond or field, with mirrors at other corners to create a detection zone. - Long-distance wireless communication: Install paired laser transceivers on rooftops of distant buildings and use microcontroller serial protocols to transmit data. Note: Due to variations in lighting and display settings, the actual product color may differ slightly from images. Slight dimensional differences may occur due to manual measurement.