1.8.6~8.8US$per
2.7+7dbi
3.2000mw
4.wifi manufactory

Features:

8.6~8.8US$per, sampls price is 12US$per (10pcc)
1. With double 7dBi+7dbi  omnidirectional Antenna;
2. Connects at a full 54Mbps via USB 2.0, up to 8 times faster than a USB 1.1 adapter;
3. High gain upgradeable Compact size for greater flexibility;
4. Also compatible with USB 1.1 desktop and notebook computers.
 
Specifications:
Wireless Standard IEEE 802.11b/g
Interface USB 2.0/1.1
Frequency Range 2.412GHZ ~2.484GHZ unlicensed ISM band
Chipset RTL8187L
Reception range 3600meters
Data rate IEEE 802.11b:1,2,5,5 ,11Mbps , IEEE 802.11g:6,9,12,18,24,36,54Mbps
Security WEP (64/128/256bit),WPA,WPA-PSK,WPA2 TKIP/AES , WPA2-PSK
Antenna RP-SMA double 7DBI
OS Supported Windows 98SE,Me,2000,XP,windows7, Vista ,MAC,Linux 
Transmit Power 27dBm ± 1dBm
Reception Sensitive Operating at 11Mbps:<-82dBm@8%FER , 54Mbps:<-70dBm@8%FER
Size 14.5cm*17cm*4cm
Weight 230g
Storage - 10 ~ 55 Celsius
Humidity 10 ~90% (non-condensing)