Sierra 320u unlocked
What's special about Sierra 320U
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1) Speed: LTE up to 100Mbps, 3G (DC-HSPA+, HSPA+, HSPA, UMTS) up to 42Mbps.
2) Dual internal omni antenna - better reception and sensitivity power.
3) Support using dual external 3G antenna - MIMO technology!
4) Solid chrome internal body wrap - much better than Huawei/ZTE full plastic body!
5) Rotating usb connector - for conveniency and adjusting reception angle easily! And it's chrome made, much solid than Huawei plastic made rotating usb connector.
6) Qualcomm chipset!
7) Less heat compared with Huawei/ZTE model using Qualcomm chipset.
8) USB extension cable support: can use 5 meter cable or beyond still under normal working condition. Generally usb modem support up to 3 meter maximum for normal operation.
Sierra 320U Specifications:
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* Network Technology: LTE,  3G Dual Carrier HSPA+,HSPA+, HSPA
* Frequency Bands:
      LTE 1800 MHz
      WCDMA/UMTS 850/2100 MHz
     
* Speed:downlink 100Mbps,uplink 50Mbps
* Operating System Support: Windows 7 SP1/Windows Vista/ XP, Mac OS X, Linux Ubuntu 9.04
* Operating Temperature: 0 to 35 degrees Celsius
* USB interface
* Device Dimensions: 50 mm (L) x 64 mm (W) x 11 mm (H)
* Weight: 55 g
* External Antenna connector

** What is 3G Dual Carrier HSPA+? check here: http://www.modem3g.com/whats-dual-carrier





SUPPORT 2 EXTERNAL 3G ANTENNA! MIMO technology
Note: Must use specific converter for Sierra. Those antenna/converter for Huawei CANNOT BE USED!




Dealing:
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Retail purchase: 1 unit also can order. No need bulk (while still got stock)
Trade bulk: 1 person buying several units also can.