Micro 5-pin USB (Universal Serial Bus) to Ethernet LAN RJ45 network card adapter for Mac Book Supports 10/100 Mbps auto-sensing capability Enable to connect to the internet via the USB (Universal Serial Bus) port Compliant with IEEE 802.3 (10 Based-T) & 802.3u (100 Based-TX) standards Support both full-duplex & half-duplex operations Plug & Playing installation