The 100M Ethernet Media Converters are designed to transmit and receive 10/100Mbps data over optical fiber. The electrical interface Auto-Negotiate to a 10Mbps or 100Mbps Ethernet rate without any adjustments. The optical interface operates at a 100Mbps Ethernet rate. Both are environmentally hardened to operate in extreme temperatures. LED indicators are provided for confirming equipment operating status. Type: Optic Media Converter Connector A: 2 SC Connector B: 4 RJ45 Distance: 0-20KM RJ45 Port Rate: 10/100Mbps(Self-adapting) Optic Interface: SC Single Fiber Fiber Optic Port Rate Fiber: 2x155M Wavelength: 1310/1550nm note:Only optic converter, no power adapter. Colour:Black Material:PC+Plastic Package Contents: 1 x 100M fiber optic transceiver(Due to different product batches, the appearance , which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.