In addition to the convenient backward compatibility, its dual 2.4 and 5.0 GHz bands provide more options when it comes to wireless channel support. Your neighbors could be using the same band and channel you are, so by simply switching to a lesser-used one you can dramatically improve your network's performance. This added performance is also helped by the three separate antennas that are connected to the adapter--greatly enhancing the sensitivity to the Wi-Fi in your home or office.

TEW-664UB Dual Band Wireless USB Adapter TRENDnet's compact N900 Dual Band Wireless USB Adapter, model TEW-664UB, connects a laptop or desktop computer to an ultra-high performance 450Mbps dual band wireless network.
Quickly connect to a 450Mbps 2.4GHz or 5GHz wireless network at the touch of a button with the convenience of one-touch Wi-Fi Protected Setup (WPS). Seamlessly stream HD video over the less congested 5GHz band.
Place the adapter in the most ergonomic location with the included USB extension cable. Advanced Multiple Input Multiple Output (MIMO) antenna technology with three spatial streams per antenna generates a maximum theoretical wireless throughput of 450Mbps. WMM Quality of Service (QoS) technology prioritizes gaming, Internet calls, and video streams. LEDs on the front of the adapter convey device status. Upgrade your computer's wireless connection to experience the speed of a 450Mbps network.
Overview – TEW-664UBUpgrade your computer to 300 Mbps Dual Band Wireless N
Connects to a 2.4 GHz or a 5 GHz wireless network
Seamlessly stream HD video over the less congested 5 GHz band
One-touch connection to router with the Wi-Fi Protected Setup (WPS) button

Hardware:USB 2.0 connector
Compatible with IEEE 802.11a/b/g/n standards
Two high performance internal antennas

Wireless:Multiple Input Multiple Output (MIMO) antenna technology
Wi-Fi Multimedia (WMM) Quality of Service (QoS) data prioritization
Supports Ad-Hoc or Infrastructure mode
Networking Solution

TRENDnet USB Adapter Comparison ChartModel TEW-684UB TEW-664UB TEW-624UB TEW-649UB TEW-648UB Product Title N900 Dual Band Wireless USB Adapter N600 Wireless Dual Band USB Adapter N300 Mini Wireless USB Adapter Mini Wireless N Speed USB Adapter 150Mbps Mini Wireless N USB Adapter CharacteristicsWi-Fi Bands2.4GHz and 5GHz2.4GHz and 5GHz2.4GHz2.4GHz2.4GHzUpload450Mbps300Mbps300Mbps150Mbps150MbpsDownload450Mbps300Mbps300Mbps300Mbps150MbpsExternal Wi-Fi Protected
Setup (WPS) Button✔✔✔✔✔WPS Support✔✔✔✔✔SecurityWPA2-PSKWPA2-PSKWPA2-PSKWPA2-PSKWPA2-PSK
Package Contents:TEW-664UB
CD-ROM (Utility and Driver)
Multi-Language Quick Installation Guide
1 x USB Cable (15.5 cm / 6.1 in)