If the laser head needs to be lit for a long time, please increase the current limiting resistance appropriately. 1. Never point the laser at yourself or others' eyes at any time. Even if the laser is turned off, it may be accidentally activated. 2. Do not direct the laser toward any reflective or smooth surfaces. Lasers can reflect off such surfaces, and accidental exposure to eyes may cause injury. 3. This laser 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. 4. Wear appropriate laser safety goggles when operating the device, especially when using invisible lasers. 5. Do not aim the laser at vehicles, aircraft, or any manned vehicles. 6. Handle the laser battery with care to prevent short circuits, overheating, combustion, or explosion, especially during removal or replacement. The unique principles of laser emission and generation give lasers characteristics 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 @ 10mm–15mm This laser head is commonly used in laser devices, leveling tools, alignment instruments, and similar applications. The unit consists of three components: a light-emitting diode core, condenser lens, and copper adjustment sleeve. It arrives fully assembled with the focal length pre-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 over long distances. With 20mA operating current and clear atmospheric conditions, the beam can reach beyond 1km. The spot remains clearly visible on objects up to 200 meters away on overcast nights. At closer ranges, visibility remains strong even under daylight conditions on outdoor surfaces such as roads and buildings. Applications include: - Electronic pointing device: Teachers can use the laser dot during presentations to highlight areas of interest. - Electronic level tool: Mount the laser on a rotating base to project a straight line onto walls 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 window and detect vibrations from reflected light to capture sound vibrations (for authorized use only). - Remote light-controlled security alarm: Set up a laser emitter and photosensor at one corner of an area (e.g., garden or pond), with mirrors at other corners to form a detection perimeter. - Long-distance wireless communication: Install paired laser transceivers on rooftops of two distant buildings and use serial communication protocols to transmit data. Note: Due to variations in lighting and display settings, the product color may differ slightly from images. Slight dimensional differences may occur due to manual measurement. Sold by Minnanxin