Never point the laser at yourself or others' eyes at any time. Even if the laser is turned off, it may be accidentally activated. The laser should not be directed at any reflective or smooth surfaces, as reflections can occur and potentially cause eye injury. This laser product is not a toy and should not be used by children, individuals with limited understanding, or those unfamiliar with laser safety. Misuse may result in injury. Use appropriate laser safety goggles when operating the device, especially with invisible wavelengths. Do not aim the laser at vehicles, aircraft, or any manned vehicle. Handle the battery with care to avoid short circuits, overheating, combustion, or explosion. Ensure proper battery installation and prevent unauthorized access. The unique principles of laser generation give it distinct properties compared to 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: 10mm15mm at 15m This laser head is commonly used in laser pointers, leveling tools, alignment devices, and similar applications. It consists of three main components: a light-emitting tube core, condenser lens, and copper adjustment sleeve. The unit is pre-assembled, pre-focused, and securely bonded before shipping. Simply connect to a 3V DC power supply to operate. Under ideal conditions (clear air, no obstructions), laser beams can travel long distances. With a 20mA operating current, the beam can reach over 1km in high-quality atmospheric conditions. The spot remains visible on objects up to 200 meters away on cloudy nights. At closer ranges, visibility remains strong even in daylight on outdoor surfaces such as roads and buildings. Applications include: - Educational 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 in construction or decoration. - Micro LCD projection system: 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 and detect vibrations from reflected light to monitor sound activity. - Remote light-controlled security alarm: Set up a laser beam and photoresistor at one corner of an area (e.g., pond or field), with reflectors at other corners to create an invisible detection zone. - Long-distance wireless communication: Install paired laser transceivers on rooftops of distant buildings and use microcontroller serial protocols to transmit data.