The LDPR 1550R from OSI Laser Diode, Inc. is a Fiber Optic Receiver with Data Rate 0.25 Mb/s, Detector Sensitivity -54 to -56 dBm, Optical Power 25 dBm, Wavelength Range 1550 nm, Supply Voltage 4.75 to 5.25 V. More details for LDPR 1550R can be seen below.