The BD-1234-SPM from Shanghai Baudcom Communication Device is a Fiber Optic Transceiver with Data Rate 1.25 Gb/s, 2.5 Gb/s, Wavelength 1290 to 1500 nm (Tx), 1480 to 1500 nm (Rx), Distance/Reach 20 km, Output Power 0.5 to 5 dBm, Receiver Sensitivity -28 dBm. More details for BD-1234-SPM can be seen below.