LB1 High Performance 600Mbps Dual Band Long-Range USB Wifi Wireless-AC/N LAN Network Adapter for Dell OptiPlex 790 SFF Desktop - Ultra Fast (5GHz 433Mbps, 2.4 GHz 150Mbps) 5dBi High Gain Antenna, Supports 802.11 N and Backward Compatible w/ 802.11 a/b/g/n Products ENJOY WIFI WITH NO MODIFICATIONS REQUIRED Adapter lets you get online using any wireless router without having to update or upgrade your hardware EASY TO INSTALL & USE Setup CD included; Once you've run the software, you can simply insert the adapter to get connected POWERFUL ANTENNA High Gain Long-Range 5dBi Antenna can help you connect even when signals are weak DUAL BAND DESIGN Modifies performance to reduce freezing and lags when streaming and gaming SATISFACTION GUARANTEE If you're not pleased with the performance of this adapter within 60 days of your purchase, we'll refund your money!