Pair of 1 x ESFA-1G-BX-U 1000BASE-BX20, single mode, LC Connector, Bidirectional, and 1 x ESFA-1G-BX-D 1000BASE-BX20, single mode, LC Connector, Bidirectional.

"Price for one pair:
1 x ESFA-1G-BX-U: 1000BASE-BX20, single mode, LC Connector, Bidirectional. Up to 20km transmission distance. T1310.
1 x ESFA-1G-BX-D: 1000BASE-BX20, single mode, LC Connector, Bidirectional. Up to 20km transmission distance. R1510"