1.Indicate the signal direction 2.Based on non-destructive tech. 3.Detect 270Hz,1KHz,2KHz 4.0.25mm,0.9mm,2.5mm,3.0mm SM Name OFI-400 Wavelength Range800 to 1700nm (SM)Recognizable signal typeCW, 2kHz, 1kHz, 270Hz ±10%Detector TypeInGaAs 2 pcsFiber Type0.9/0.25/2.5/3.0mm SM fiberSensitivity1310nm: +10dB to -20 dBm (Continuous Wave)1550nm: +10dB to -30 dBm (Continuous Wave)LED IndicatorSignal ...