Features 1、All-metal optical fiber red light pen 20 km, high-quality laser chip, adopt aluminum alloy material, more suitable for special outdoor environments 2、The pen body adopts anodizing technology, which is not easy to change color and fall off. 3、Button protection layer, 360° rotation, to avoid operating errors, packaging keys are not damaged 4、Including constant light, fast flash and slow flash three working modes to meet multiple needs 5、Suitable for SC, ST, FC interface Specification Item Type: Optic Fiber Fault Locator Output Optical Power: 20mW Working Temperature: 10-60℃ (without condensation) Storage Temperature: -40-85℃ Applicable Fiber: Single-mode, Multi-mode Shell Material: Aluminum alloy Output Wavelength: 650 ±10nm Power Supply: 2 x AA batteries (without battery) Package List 1 x Visual Fault Locator 1 x Cover 1 x Core 1 x User Manual