Product Name: Green Light Pen Output Wavelength: 510nm Universal Connector: 2.5mm (FC/SC/) Battery Type: 18650 Lithium-Ion Battery Weight: 0.22kg Output Power: 30mW Light source: Powerful and penetrating, with stable light output and easy to find breakpoints. Body: Made of textured aluminum alloy, it's and sturdy, with a non-slip feel. Charging: Supports Type-C fast charging, allowing it to charge a variety of devices. Battery: The battery capacity, with long battery life and no false labeling. Color: As Shown Material: ABS Package Contents: 1 * optical fiber fault detection pen 1 * anti-drop wrist strap 1 * data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.