On the interface it says Mini USB, is there different size USB ports? Or just one standard size?

It's a standard size USB port. Maybe the Mini USB is describing the fact that it doesn't stick out very far from the port so that you can leave it in your laptop all the time.

can i upgrade her antenna to 18 dbi ?

The antenna is removable. Any antenna with an RP-SMA connector will work. I have mine connected to a 25db parabolic antenna.

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TP-Link Wireless Adapters Comparison Sheet

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TP-LINK TL-WN7200ND Wireless N150 High Power USB Adapter, Up to 500mw, w/5 dBi High Gain Detachable Antenna, IEEE 802.11b/g/n, WEP, WPA/WPA2

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Great penetrability and range
Up to 500mw power output
5 dBi High Gain Detachable Antenna
4.9 Feet USB extension cable
Easy encryption w/ WPS button
Plug & Play for Windows 8

Overview

Specs

Reviews (5)

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Model
Brand	TP-Link
Model	TL-WN7200ND

Details
Color	Black
Standards	IEEE 802.11b/g/n
Wireless Data Rates	Up to 150Mbps
Security	64/128 bit WEP, WPA/WPA2/WPA-PSK/WPA2-PSK, Wireless MAC Filtering
Interface	Mini USB
Frequency Band	2.4 GHz - 2.4835 GHz
Modulation	DBPSK, DQPSK, CCK, OFDM, 16-QAM, 64-QAM
Transmitted Power	<20dBm (EIRP, For countries using CE Standards) <27dBm (EIRP, For countries using FCC Standards)
Antenna	1 x External 5dBi Detachable Omni Directional Antenna
System Requirements	Windows 7(32/64bits), Windows Vista(32/64bits), Windows XP(32/64bits), Windows 2000

Feature
Features	Button: Qss Push Button/software Antenna Type: Detachable, Omni Directional Antenna Gain: 5dbi Work Mode: Ad-Hoc / Infrastructure mode Special Function: WMM,Soft AP (For Windows 7/ XP/ Vista), PSP X-LINK(For Windows XP), Roaming.

Dimensions & Weight
Dimensions	3.6" x 2.4" x 1.0"
Weight	0.4

Environmental
Temperature	0°C - 40°C (32°F - 104°F)
Humidity	10% - 90% (Non-Condensing)

Packaging
Package Contents	Wireless Adapter TL-WN7200ND 5dBi detachable Omni directional antenna Resource CD Quick Installation Guide 1.5m USB Extension Cable

Additional Information
First Listed on Newegg	August 25, 2010

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Warranty

Limited Warranty period (parts): 2 years
Limited Warranty period (labor): 2 years
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Return for replacement within: 30 days

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TP-LINK TL-WN7200ND Wireless N150 High Power USB Adapter, Up to 500mw, w/5 dBi High Gain Detachable Antenna, IEEE 802.11b/g/n, WEP, WPA/WPA2

Learn more about the TP-Link TL-WN7200ND

Customer Reviews of the TP-Link TL-WN7200ND

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16833704055

TP-LINK TL-WN7200ND Wireless N150 High Power USB Adapter, Up to 500mw, w/5 dBi High Gain Detachable Antenna, IEEE 802.11b/g/n, WEP, WPA/WPA2

Learn more about the TP-Link TL-WN7200ND

Customer Reviews of the TP-Link TL-WN7200ND

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info