1. Material: ceramics, metal, electronic components 2. Scope of use: red light pen, optical power meter, jumper, optical fiber communication room, optical test equipment, LAN wiring 3. Function: low insertion loss, good repeatability, large return loss 4. Interchangeability: 0.2dB 5. Working wavelength: 1200-1600nm 6. Loss rate: 0.5dB 7. Insertion times: 1000 8. Working temperature: minus 40-95 degrees Celsius 9. Storage temperature: minus 55-85 degrees Celsius 10. Good inter-plug performance, good flame retardancy, high temperature resistance, environmental protection, high impact strength 11. Low insertion loss, which can meet the transmission requirements of different wavelengths 12. Good isolation effect, effectively suppress the noise of the ground loop, isolate other types of interference signals, and avoid accidental damage to the main control system 13. Product size: 4.2 x 1 cm 14. Weight: about 10 grams (including packaging)