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.