Cheap And Discounts 1 Pair Nokoxin H3C Huawe Ciscoo GE-SX-MM850-A 550m Optical Module Gigabit Multimode Dual Fiber Optical Module 1.25G Wholesale. Buy Directly From Merchant Pro Communication Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.