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. 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 wavelengths. Do not aim the laser at vehicles, aircraft, or any manned vehicle. Handle the laser battery with care to avoid short circuits, overheating, combustion, or explosion. Ensure proper battery installation and prevent unauthorized removal. 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: -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 such as levels, alignment tools, and measurement instruments. It consists of three components: a light-emitting tube core, condenser lens, and copper adjustable sleeve. The unit is pre-assembled and focused before shipping, with the lens secured using strong adhesive. It operates with a 3V DC power supply. 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 air conditions. The spot remains clearly visible on objects up to 200 meters away on cloudy nights. At closer ranges, visibility remains strong even in daylight on outdoor surfaces. Applications include: - Laser pointer pen for classroom presentations - Electronic level tool using rotating projection for alignment during construction or decoration - Micro LCD projection system by removing the condenser and projecting through a controllable LCD - Long-range monitoring via laser reflection from glass surfaces to detect vibrations - Remote photoelectric security alarm using laser beams and photodetectors across open areas - Long-distance wireless communication using paired laser transceivers and serial data transmission