Never point the laser at yourself or others' eyes at any time. Even when the laser is turned off, it may accidentally turn on. The laser should not be directed at any reflective or smooth surfaces, as the beam can reflect and potentially cause eye injury if it contacts the eyes. This laser 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. Wear appropriate laser safety goggles when operating the device, especially when working with invisible wavelengths. Do not aim the laser at vehicles, aircraft, or any manned vehicles. Handle the laser battery with care to prevent short circuits, fire, or explosion. Ensure proper battery installation and avoid unauthorized removal. The unique principles of laser generation give it distinct properties 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 tools, leveling devices, and alignment instruments. It consists of three components: a light-emitting diode core, a condenser lens, and a copper adjustment sleeve. The unit is pre-assembled, pre-focused, and securely glued before shipping. It operates with 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 in high-quality atmospheric conditions. The dot remains clearly visible on objects up to 200 meters away on cloudy nights. At closer ranges, the beam is clearly visible on outdoor surfaces even in daylight. Applications include: - Educational laser pointer: used by teachers to highlight areas of interest during presentations. - Electronic level tool: when mounted on a rotating base, it projects a straight line for alignment in construction or decoration. - Micro LCD projection: by removing the condenser lens, the laser can project images through a controllable LCD screen. - Long-range laser monitoring: the beam can be reflected off glass to detect vibrations and recover sound from a distance. - Remote light-controlled security alarm: a laser beam and photosensor can be set up with mirrors to create a perimeter alarm system for areas such as ponds or fields. - Long-distance wireless communication: using paired laser transceivers mounted on separate buildings, data can be transmitted via serial communication protocols.