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 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 with invisible wavelengths. Do not aim the laser at vehicles, aircraft, or any manned vehicles. Handle the laser's battery with care to avoid short circuits, overheating, or potential explosion. Prevent unauthorized access to the battery compartment. The unique principles of laser emission give it 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, 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 secured with strong adhesive before shipping. Simply connect to a 3V DC power source 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 air. 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. Applications include: - Educational laser pointer: assist in classroom instruction by highlighting areas of interest. - Electronic level tool: project a straight line when paired with a rotating mount for alignment during decoration or mounting. - 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 onto a glass surface and detect reflected beam vibrations to sense sound activity. - Remote light-controlled security alarm: set up a laser beam and photosensor across a protected area, using mirrors to create a detection perimeter. - Long-range wireless communication: use paired laser transceivers on separate buildings to transmit data via serial communication protocols.