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 should not be directed at any reflective or smooth surfaces, as reflections can occur and potentially cause eye injury if they enter the eyes. This product is not a toy and should not be used by children, individuals with limited understanding, or those unfamiliar with laser properties, as misuse may result in injury. Wear appropriate protective eyewear when operating the laser, especially when using invisible laser beams. Do not aim the laser at vehicles, aircraft, or any manned vehicles. Handle the laser's battery with care to avoid short circuits, overheating, combustion, or explosion, particularly during removal or replacement. The unique principles of laser emission give it 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: -36C to 65C Storage Temperature: -36C to 65C Spot Size: 10mm to 15mm at 15m This laser head is commonly used in laser pointers, leveling tools, and alignment devices. It consists of three main components: a light-emitting tube core, condenser lens, and copper adjustable sleeve. The unit is pre-assembled before shipping, with focal length adjusted and secured using strong adhesive. It operates when connected to a 3V DC power supply. Under ideal conditions (clear air, no obstructions), the laser beam can travel long distances. With a 20mA operating current, the visible range can exceed 1km under good atmospheric conditions. The spot remains clearly visible on objects up to 200 meters away on overcast nights. At closer ranges, visibility remains strong even in daylight on outdoor surfaces such as roads and buildings. Applications include: - Educational pointer: Teachers can use the laser dot to highlight areas of interest during presentations. - 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: Direct the laser onto a glass surface and detect reflected beam vibrations to sense sound-induced movements. - Remote light-controlled security alarm: Set up a laser emitter and photosensor at one corner of an area, with reflectors at other corners to create a detection barrier. - Long-distance wireless communication: Install paired laser transceivers on rooftops of distant buildings and use serial communication protocols to transmit data.