This durable laser pen, made of aviation aluminum alloy, features a child safety lock. External focusing allows for easy adjustment of the light column and spot size. The 18650 rechargeable battery provides long battery life. The built-in laser module enhances heat dissipation and incorporates circuit board acquisition and protection design. This green light laser pen is suitable for use in cold environments and includes two keys. **Features:** * Made of durable aviation aluminum alloy with a child safety lock. When not in use, turn the switch key to the red dot and remove it to disconnect the power. * External focusing allows for easy adjustment of the light column thickness and spot size. It uses a high-capacity 18650 rechargeable battery for extended battery life. * The built-in laser module improves heat dissipation and incorporates circuit board acquisition and protection design. Green light performance is significantly affected by climate; therefore, it is suitable for use in cold environments and may require preheating in a pocket. **Specifications:** * Material: Hard aluminum * Surface treatment: Anodizing * Switching mode: Light touch switch * Green wavelength: 532nm * Start-up time: 0.001 seconds * Working voltage: DC3.7V * Dimensions: 22x158mm * Battery: 18650 rechargeable battery (not included) **Package included:** * 1 x Laser Pen (Battery not included)