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. Laser light has high reflectivity and may reflect off such surfaces, potentially causing 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 properties. Misuse can result in injury. Wear appropriate laser safety goggles when operating the device, especially with invisible laser beams. Do not direct the laser beam toward vehicles, aircraft, or any manned vehicles. Handle the laser battery with care to prevent short circuits, fire, or explosion. Ensure the battery compartment is secure and protected from tampering. The unique principles of laser emission and generation give laser light distinct characteristics not found in ordinary light: high monochromaticity, high coherence, high directionality, and high 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 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 tube core, condenser lens, and copper adjustment sleeve. The unit is pre-assembled, pre-focused, and securely bonded before shipment. Simply connect to a 3V DC power supply to operate. Under ideal conditions (no dust, smoke, or obstructions), laser beams can travel long distances. With a 20mA operating current, the beam can reach over 1km in clear air. The spot remains visible on objects up to 200 meters away on overcast nights. At closer ranges, the beam is clearly visible on outdoor surfaces even in daylight. Applications include: - Laser pointer for educational use: teachers can highlight areas of interest during presentations. - Electronic level tool: rotate the laser head 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 project images. - Long-distance monitoring: direct the laser at a glass surface and detect vibrations in the reflected beam to monitor sound activity. - Remote light-controlled security alarm: set up a laser beam and sensor with reflectors to create a perimeter alert system. - Long-range wireless communication: use paired laser transceivers on separate buildings to transmit data via serial communication protocols.