The price is for 5 units of - 25.78G SFP28 LR 10km Optical Transceiver
OTS-25G-LRFeatures◎ Supports 25.78125Gb/s serial optical interface
◎ Up to 10km transmission on SMF
◎ 1310nm DFB laser and PIN receiver
◎ Hot-pluggable SFP28 footprint
◎ Built-in digital diagnostic functions
◎ Single +3.3V power supply
◎ Power consumption less than 1.2 W
◎ Operating case temperature: -5~+70°C
◎ Internal CDR on both transmitter and receiver channel
◎ Support CDR bypass
◎ SFP28 MSA package with Duplex LC connector Worldwide shipping with tracking number.