The FESL-840-02-Coax from Frankfurt Laser Company is a Superluminescent Diode with Wavelength 820 to 860 nm, Output Power 4 mW, Bandwidth (FWHM) 40 to 50 nm, Operating Current 120 mA, Forward Voltage 3 V. More details for FESL-840-02-Coax can be seen below.