Cheap And Discounts Dual Fiber Optical Transceiver Module for CWDM System,12G 1270-1610nm,4K,SFP + CWDM 10KM, Dulex LCUPC Wholesale. Buy Directly From Merchant NVOC Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.