When operating in 802.11b mode: Has 800mW of Tx output power: 

All 802.11g/b cards have their longest-distance capability in 802.11b mode:  Read about this here

802.11b mode has all the bandwidth that you need if your purpose for the connection is broadband-speed internet access only.

802.11g-mode:  250mW Tx power in G-mode

Threaded antenna jack for durability & ability to upgrade antennas & add extension cables to antennas

Option to upgrade to high-gain antennas for long distance networking: RP-SMA (female): threaded jacks / connectors

Detachable antenna is included: 5dBi

SECURITY: WEP 64-bit and 128-bit, WPA (TKIP with IEEE 802.1x), WPA2 (AES with IEEE 802.1x)

Supports SoftAP function - allows user to create AP function at your computer

Easy installation and hot-plugging - flexibility and convenience of USB connections. Quickly and easily connect to wireless network with minimal install time and effort.

New in box, with CD-ROM with User Manual, drivers, Windows-based configuration utility and status monitoring, full documentation in PDF format. Includes USB cable.

If you have an internal wireless card: You can use this USB 800mW adapter by disabling your internal card (in Device Manager).

EXTEND RANGE WITH ANTENNAS, MOUNTS & USB EXT. CABLES:

Click here for antennas/accessories page or click individual accessory-type below: 

ANTENNA UPGRADES TO EXTEND RANGE & antenna-cables     ANTENNA: 9dBi $10.99

USB EXTENSION CABLES:  To place device in line-of-sight, outdoors, and/or high above PC

OUTDOOR ENCLOSURE / MOUNT (sold separately):  $9.99