TP-Link's TL-SM311LS Single-Mode Fibre Module Cards are designed for extending transfer distance between managed switches, media converters and other TP Link products such as the Smart PoE+ Switch, Web Smart Switch and the JetStream Stackable Managed Switch. When attached to TP-Links managed/smart switches, they can extend the distance to several kilometers even tens of kilometres which will satisfy the distance requirement of LAN. Users can choose whether and which items to use the fibre modules according to the demand in order to lower cost. Features Single-mode MiniGBIC module Suitable Products: TL-SG5428, TL-SL5428E, TL-SG3210/3216/3424/3424P, TL-SL3428/3452, TL-SG2216/2424, TL-SL2210WEB/2218WEB/2428WEB/2452WEB, TL-SL1351 and MC220L Supports Full-Duplex. Plug-and-Play. Supports Pull-or-Plug with power on switches Power: internal power from switches Warranty 3-Year Manufacturer’s Warranty