Specifications: Network Data Link Protocol: 802.11b, 802.11g, 802.11n (draft) Status Indicators: Link/activity Connectivity Technology: Wireless Spread Spectrum Method: OFDM, DSSS Frequency Band: 2.4 GHz Up to 300 Mbps for raw data transfer rate Compliant Standards: IEEE 802.11b, IEEE 802.11g, IEEE 802.11n (draft) Dimensions: 13x12x2cm/5.12x4.72x0.79" Device Type: adapter Form Factor: Plug-in card Interface (Bus) Type: PCI Express x1 Software / System Requirements Peripherals/Interface Devices: CD-ROM System Requirements Details: 20 MB Software Included: Drivers & utilities OS Required: for Windows 2000 SP4 or later Additional Requirements: CD-ROM Antenna Antenna: External detachable Directivity: Omni-directional Expansion / Connections Compatible Slots: 1 x PCI Express x1 Quantity: 1 set Note: Please allow 0-3mm error due to manual measurement. make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color. Thank you! Package Includes: 1 x D-Link DWA-556 Wireless N Adapter (with full-height mounting bracket) 3 x Detachable Antennas