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HUAWEI B681 Specifications:
* 3G: HSPA+/UMTS 900/2100 MHz
* 2G: EDGE/GPRS/GSM 850/900/1800/1900MHz
* Download: up to 21.6 Mbps, ready to upgrade to 28.8Mbps
* Upload: up to 5.76 Mbps
* 2 RJ45 ports and 1 RJ11 port
* 802.11 b/g/n
* 1 port for external antenna
* MicroSD card slot up to 32GB
* Ports USB 2.0 host interface
* Display: Led indicator
* Size: 180x123x32.5 mm.
* Weight 300g.
* Supported Systems: Windows 2000, Windows XP, Windows Vista, Windows 7.