Package includes15PC SC/APC Female to SC/UPC Male SingleMode Hybrid Optical Fiber Convertor/Adapter/Coupler. ^^ FeatureReturn loss (1310nm) 50DB, Return loss(1550nm 50dB; Insertion loss (1310nm) 0.30 dB, Insertion loss (1550nm) 0.30 dB. ^^ ApplicationConnects SC fiber environments to SC fiber applications. ^^ StanderOur products meet the Telcordia and IEC 61755 stander, all materials compliant with RoHS requirement. ^^ After-sale service18 months after-sales service gives you a good shopping experience. If you have any problem, please contact us, we will solve it for you and make you reap satisfaction.